I like the idea of an electric device since it would be so much easier to install, but don't think there is any comparison to the strength that you get from hydraulics. It's not even night and day, it's what works. I was more then a little intimidated about figuring out how to make a grapple work on my tractor, but after awhile, it sort of came to me. There are allot of threads on it here and plenty of experts who have been very helpful in walking the rest of us through the process. Once you do it, you'll realize it really wasn't all that difficult, it's just something new.
The reason for the grapple is to be able to pick up anything that your loader can lift. Having a grapple with a very limited amount of lift just defeats the entire purpose. If you are going to do it, do it right and enjoy it. Otherwise, you'll regret it and probably end up doing it twice so that you'll get something that actually works.
Good luck,
Eddie