By far, there are three varieties that will not disappoint....
Bodasious - very sweet and tender yellow corn...usually the first to get ready to harvest from the extended family corn patch. Similar to old "golden bantam" but much, much sweeter.
Silver King - very sweet yellow corn; larger than bodasious, more corn per ear; yield is really good if you are planning to put some in the freezer. Comes in about 10 days after Bodasious.
Silver Queen - white corn favorite - comes in about the same time as Silver King.
I personally favor silver king simply for the yield. We blanch it, cut it off the cob with a sharp knife (just the top of the kernels), then take the back of a butter knife and scrape it to get all the goodie. We then put about 2.5 to 3 cups in a quart ziplock bag, carefully get all the air out and lay it flat in the freeze. That way you can stack it very well. Usually put up about 30-40 bags a year plus all you can eat for at least a month....starting around Mother's day or the week after.