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I differ with many folks opinion here. Yes, 22", 24" or higher radius is great. Yes, you have more flexibility in what you can run. HOWEVER, in the real world a lot of us face the choice of 18" or nuthin'... If it's a choice between a layout in limited space where 18" is the only way you'll get anything but a "snooze-o-rama" loop, then by all means go to 18". Just DO be aware of the limitations - you'll be much happier running an American 4-4-0 and old-fashioned shorty cars than trying to make 18" and an articulated loco with 80' passenger cars make nice. But there are many options you STILL DO have with 18". Another option in limited space is drop to N gauge or lower. Personally I find it unsatisfying, and have too much investment in HO rolling stock to change now. But it is an option - especially if you have little space AND are starting from scratch. So yes, go with 22" or even more if you can. If you cannot, don't shrug and walk away. Go with the 18", make sure you don't try to run what you shouldn't, and have a blast!
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