I have acrylic, and I WISH I could tell you to just go acrylic. I can't.
No royal pleco's, or any pleco's, in an acrylic tank--that's a real serious problem. I understand stingrays scratch up acrylic tanks, too. So another serious problem. So that's 2 of the top 3 best reasons to keep FW aquaria, you can't put in your tank.
BUT--and this is just me now--I just can't get comfortable with a glass tank over 250-300 gallons. Too much water, glass panels are too long, it just bothers me. And if it ever does scratch, it's just scratched. Scratch acrylic, you can get it out. Not with glass.
Acrylic is lighter, warmer, easier to drill, somewhat kinda repairable if scratched, and I LOVE the way the overflows/lip/lid are all fused together so there's no way for fish to get into the overflow. Can't really do that with glass tanks.
But, acrylic's EXPENSIVE. Unreasonably expensive.
But, I HAVE seen people with HUGE glass tanks--12 foot long glass tanks, been up for years--but I wouldn't try it. That's just me.