To me, the only kettle to consider for practical everyday use is either a 26 or a Ranch Kettle. They are both very large with a lot of room and space to work with and cook on. I have them both and wish I could narrow it down to either one or the other, but I can't because each has something I like that the other doesn't. I have a brand new 22 inch Performer Platinum sitting in my garage that I haven't used in almost a year.
The 26 has one touch control and the ash collection feature, but it's smaller than the Ranch Kettle and isn't mounted on a four wheeled cart (which I love). The Ranch Kettle on the other hand, is larger, it's mounted on a four wheel cart and can accommodate a built-in Weber light for night time cooking. To me, the ideal grill would be a Ranch Kettle with a one touch control system and a side table that flips up and down like the Performer Silver. If Weber ever produced that, I would refinance my home to buy it if that's what it took.
Between a 22 and a 26, I would go with a 26 without thinking twice. Keep in mind that older "flat top" 26'ers produced in the 1990's use a different size cooking grate that is no longer available. So if it were me, I would go with a newer 26 if you can.