RE: Does size really matter?
A single RRC Lithium Polymer 4S 1P 14.8V, 3000 mAh 25/30C battery costs about $172.00. That's an awful lot of glow fuel.
Electrics are just fine, but economical is not one of their good points. Just be sure of what you want and need before jumping into the electric arena.
Completely draining the tank and putting a paper wad into the muffler port will eliminate any fuel odors. Putting the cap on the fuel jug after you are done will eliminate odors from that (and protect it from moisture accumulation).
Lipo battery packs must be charged outdoors. They are very dangerous if abused (and have been known to burst into flames for no apparent reason).
Just be careful what you choose and why. You can store a good glow plane in a small apartment just as easy as you can an electric. The only real difference is the support equipemnt, and a gallon of fuel does not take up much room at all.
CGr.