Is there any major difference between brands of glow plug relays? If so what one would you recomend?

I haven't heard or read and difference in them. I bought one from OReilly and it worked fine for 3 years now.

I bought one from autozone because they were the only store that had any in stock lol... No problems yet.

I think the one on my pickup is a GP Sorensen, but it is from Advance Auto Parts. It works fine. The one i removed was a Trombetta, although it wasn't bad so it's a spare now.