I went with the collar to avoid the foaming issue (although that can be fixed with some cash and ingenuity. Fans etc...). I also went with the collar because I could fit 2 more kegs on the hump. But the number one reason for me was the tower hitting the wall when ever you open the lid. If your freezer is several feet away from the wall or you don't mind pulling the heavy SOB out everytime (wheels would help of course) than a tower would work for you. Also my collar is attached to my lid. No worries of the shanks getting in the way of kegs or having to lift 40# kegs of beer any higher than you have to. My Frigidare 7.2 freezer has hinges that hold up my 10x1 inch collar with no problem.