I have bounced back and forth between tubular and Super O for years. The small radius issue is really not that big a deal since it is easy to make what ever radius you like. I currently have 36, 48, 54. and 72 diameter curves in my collection. I am currently using Menards 72 in diameter curves with Lionel 72 in switches but will be switching back to Super O this summer for military train season.
Rolland