wtf are you talking about man? .... most of the best thrash came out in the 80's including all of Megadeth's, Slayer's, Metalica's, Testaments, Sepultura's, Destruction's, Sodom's, Kreator's etc albums that came out in the 80's... its not even fucking comparable man ....
where the fuck do you come up with all these ridiculous conclusions of your man??
anyway, some of the best thrash albunms from the 90's IMO are...the almighty Rust in Peace, Arise, The Gathering by Testament and Devastations Idolatry .... and LOL at mentioning Watchtower when talking about the best thrash of the 80's, go listen to your fucking power metal and quit talking about shit you dont know about.