I've never owned or shot a Buckmark or Victory, so take this for what it's worth. I suspect that the decision will come down to personal preferences, as everything I see about Buckmarks and Victories is that they're very good pistols. If I had the $$$, I'd buy at least one Buckmark and one Victory. (I really like .22s.) I went with the Mark IV 22/45 Lite as a suppressor host, and it runs like a champ. Both Buckmarks and Victories are available threaded barrels, so that's a wash. However, from time to time, Volquartsen sells Mark IV uppers in their clearance section, pretty inexpensively. So I bought a 5.5" Mark IV bull-barrel upper for $25 + shipping, transfer, etc. It had no sights, so I had to add those. All total, I'm in for about $150 on that upper. But now I can swap the uppers in about 10 seconds and basically have 2 different pistols. You can also get uppers with threaded barrels, some with sights, etc. I think that's the one concrete advantage that the Mark IVs have over the other two. I leave it to you to decide whether that tips the scale.