What I like about electric power:
Very low vibration - servos/electronics/airframes last much longer. Even battery drain is lower due to not fighting vibration.
No mess to clean up
No need to worry about fuel proofing anything
No worries about starting, idle adjustment, etc.
Generally fewer "Flame Outs" if you do lose power it means something has gone very wrong.
No fuel to buy, store, transport & no glow plug battery and starter/battery to mess with.

What I do not like:
Cost, although getting better with cheaper packs available now. With electric you are buying all your fuel up front all at once.
Charging lots of batteries. Sort of a pain, but you get used to it.

For me the pros outweigh the cons.