Well, admittedly I am kind of biased. Sodom was one of the first thrash bands I ever got into whereas (for some reason) I didn't get into Kreator until my 20's.
Though lately I've been really listening to alot of Kreator - seeing that bigass Kreator sig of yours always makes me want to blast them.
I could never get into Destruction. I've got Eternal Devastation and I've listened to it a few times but it's never really 'clicked' for me. When it comes to thrash, I usually get into old demo's (Slaughter demos, Vader demos, Death Strike, etc) - mostly because I fuckin' love crust.
I'd like to get Dodens to make a nice, fat list of old, crusty thrash demos but he doesn't ever seem to frequent the rec forum that much anymore.