there are pros and cons to electric and glow and i'll give you what i can think of off the top of my head

glow- cons

1. messy
2. having to buy fuel
3. lugging around a field box
4. learning how to tune an engine

glow- pros

1. the sound of a real engine kicks butt compared to a motor
2. refueling is quick
3. RX batteries can last many flights with the right pack so you're good for a bunch of flights in the day
4. initial cost is cheaper than electric

electric- cons

1. initial cost is more expensive when you are flying the .40 size planes and up
2. having to wait for batteries to charge
3. cost of lipo batteries
4. lipo batteries can easily be damaged in a crash

electric- pros

1. no clean up
2. in the long run electric most likely is cheaper when considering the amount of flights with battery and how much fuel would be bought
3. no field box to lug around

there are more pros and cons to each but i can't think of them right now...but you just have to factor what interests you most and go with it...either way you'll be flying and that's where the fun is : )