I have the Sizzix Big Shot Pro. I use both Sizzix dies and Accuquilt Go dies with it. I like the fact that I can use dies from any manufacturer that I want and because the Big Shot Pro is so large I can use really big dies if I want. I think that I can cut more layers of fabric at a time with the Sizzix dies than with the regular Accuquilt Go dies and my experience is that the Sizzix dies are easily as durable as the Accuquilt Go dies that I own. I do not own any of the Accuquilt dies that are made specifically for the Accuquilt Studio so I don't know how those compare with Sizzix.
The down side is that the Big Shot Pro takes up a lot of space and does not fold up like the Accuquilt Go machines. The Big Shot Pro is also fairly heavy if you need to move it.
Rob