The Fu Man Chu does not ship well and they can be tough to get on frozen foods.
Go with the Fuzzy, they can be weaned over, some are just more stubborn than others. The fuzzy may grow faster when young but the growth rate seems to slow down when they get around 4 inches. My fuzzy grew pretty fast than hit that 4 inch mark and it stayed 4 inches about a year or more, it is about 4 1/2 right not.
If you are questioning tank size, both dwarfs require the same tank size.
Chances are, neither lion will be on frozen foods when you get it, pick up a feeder stick from your LFS. Start off with ghost shrimp gut loaded with something nutritional before feeding them to your dwarf. Pick up frozen Silversides, frozen Sand Eels & Frozen krill to start weaning the lion over. Soak all your frozen foods in vitamins before feeding.
Once the lion is weaned over you can than add Squid, Octo, Ocean fish, Raw Shrimp, Scallops and so on to your lions diet.
Kaye