Lots of people like their ceramic smokers. I'm talking Big Green Egg, Primo, Kamado. Relatively easy to learn, easy to keep temps, but heavy and $$$ - several hundred to over a grand. Plus some aren't large enough to handle a whole packer. I just can't spend that much money on something so limited in size when I can add a little bit to the $$$ and get me a heavy trailer mounted rig that I can cook 12+ briskets on.
My favorites smokers have vertical smoker boxes. Horizontal offsets have an inherent "problem" that bothers me - although many people use them. Heat rises - it does not necessarily travel very good horizontally. So the farther from the fire box - the cooler the temp. Now that can be used to your advantage if you are cooking a variety of sizes of meat - the biggest close to the fire - the smaller farther away. But not handy when say cooking 4 butts the same size. You have to pretty much rotate them. My favorite affordable vertical offset is a Bandera tower smoker by Char-Broil. MSRP is over $400 but can be found for much less. Academy Sports used to have them, but don't see them on their site now. If you can find a used one that is ok. I've bought one that way off Craigslist for $100 - and it was the older model that was made by New Braunfels Smokers (now-defunct). Oklahoma Joe's Longhorn Smoker is a good heavy smoker (also over $400) that can be had from Home Depot. HD also has the Brinkman for I think around $300. Horizontal but not a bad grill and relatively heavy - but a small firebox.
Just try to stay away from the cheap flimsier ones of thin sheet metal. The price is right, but they are so thin they don't act as a heat sink, so they are very hard to maintain an even low temperature. Plus they rust out fast.
Now for something more set and forget. You can always buy a controller for the above (i.e. BBQ Guru, or CyberQue or Stoker) but if you like to fiddle with the fire this may not be desirable. I have two sitting in boxes and have hooked them up to a smoker yet. However, I do have a Traeger Lil Tex that I keep at the office. They'll set you back almost seven bills, unless you look on the used market like I did. Uses wood pellets (food grade - not heating grade). You set the temp you want - feed it some pellets, check on it now and then till finished. They will get up to 500 deg so could be used to grill or cook pizzas also. They sorta act as a convection with smoke and do a very good job. The other set and forget smoker is a Bradley. It is electric and uses wood "pucks". I have a four rack digital that I got on clearance for $200, but they list for around $350. Although if you shop around enough you will eventually find someone, including Amazon, that will run them at a discount. Did not think I would ever use and recommend an electric, but they are very good machines and make good tasting 'Que although you will not get a smoke ring. I especially use mine for the smaller quicker things like chickens, baby back ribs, sausage, fish. Also can smoke cheese, and lox in it as you can use it as a cold smoker with modifications and waiting for the right season. If interested, I think I would probably buy an original Bradley (non-digital) and add an Auber Controller. For the same $$$ as a digital, you can get much tighter control of the temp. and if you get the two probe Auber you can monitor the meat temp also and have it cut off when the meat reaches your desired temp. The Auber is also programmable in that you can ramp up the temperature - which is especially helpful when smoking fresh sausages. Bradley also has a very active and fun forum to help you get started, make recommendations, help troubleshoot, get recipes, and even cooking contests and get-togethers (called smoke-outs).
I do not like the 'bullets' - the small, painted sheet metal capsule shaped "vertical water smokers" that you can get for $25 and up. Too small, plus, in my opinion, hard to control temps. And tending fire is very hard because you have to take off the grids and meat to fiddle with the fire. However, a bigger one like the Weber Smokey Mountain unit gets rave reviews and has a loyal following. Its bigger, heavier and has a side door to tend the fire. Usually a little over $200.
Conclusion
My favorite in order
Bandera
Ok Joe Longhorn (and that is real hard to say as I am an Aggie!)
Brinkman Smoke N Pit
For something for a little less green
Weber Smokey Mountain
BigUglyDrum
For $125 and less (I don't recommend buying - especially new). Craigslist is littered with these being sold by frustrated guys, their wives or kids bought them one because of the price, but they cannot make them work! They can be had for $50 or so. You can make them work, but usually have to mod. them.
Cheap Brinkman offsets
Cheap Char-Broil offsets
A bigger Weber Kettle set up to offset cook (good for ribs but not the long
brisket cooks)
Others
Budget
Inexpensive vertical water smokers
For ease
Bradley (easy, simple, good, and also does good brisket and butts)
"You gotta learn your pit just like a man learns his woman. Or you can't get nothing good outta her."