In terms of sales and popularity:
But is it truly big four? Historically yes
Of all those band I don't like Slayer, they just sound like noise to me. Especially from Reign in Blood onwards.I’ve often wondered the same, but I would ask the same question about Slayer as well.
The System Has Failed is awesome, guys. I actually just got it on vinyl.
TSHF is an amazing album and United Abominations is really good. But Endgame??? Man, hands down my #3 favorite Megadeth record of all time (even above Peace Sells...). Nevertheless, and despite their quality, none of these record enters my "big 4 top 10". Just because there's a lot of of great stuff these 4 bands released. And some of it has to be left out (The most blatant cases besides Endgame and TSHF are Ride The Lightning, Spreading The Disease, State Of Euphoria,Hell Awaits, Christ Illusion or as I mentioned Peace Sells).I would have the entire 2004-09 Megadeth album streak on my list.
Tied with Dimension Hatross and Killing Technology as my favorite Voivod album: a true masterpiece. I simply adore this record... Hugely underrated IMO. But I wouldn't call it Thrash per se. I don't even know how to label it... all I know it's psychedelic, dissonant, prog and heavy as hell. Not a single bad song. One of the best metal records from the 90's.. truly unique