Reverse flow works better with smaller smokers, as it allows more cooking space due to managing the "hot spot." Also, you can adjust temps across the smoker by raising and lowering the trailer tongue. As for larger smokers (larger than a Lang 84), the hot spot is a much smaller percentage of the total cooking area.
If you buy from a reputable pit builder, you will get a decent smoker.
Also, fuel consumption should be roughly the same, and I am regulary impressed at how much wood I have left over from a cook with my little 60.
Nauti-Que BBQ Team
Pitmaster and KCBS CBJ & CTC
Lang 60 Marie Laveau
Deep South Single Chamber Glenda
WSM 22.5 Asmarelda
22.5 OTG Samantha