its really all about technique and finding what works for you. i use glass for electric because thats what duane did and by the time i discovered lowell george, i was already stuck on glass but ive played slide with a big lighter on someone elses shredstick and made it work
I only do two songs with my band using a slide. G&L Legacy, 12" radius, DF Vibrato, strung with 9-42 Fender Super Bullets.
The slide I use is a Dunlop 280cs, chromed steel, on my pinky. It is small and light. Unfortunately, I think they discontinued this model.
Bill