Depends on your tonal goals or what sound you're trying to achieve. I've owned a Roscoe(SKB-3005), a Dingwall(ABZ5 and a Combustion), and I'm currently playing a Spector(Forte 5). All of them were/are OUTSTANDING instruments! Even though I'm all about Funk/Fusion/R&B, I make my living playing Rock, so my choice of gear usually reflects that. Although I am a proponent of the "any bass for any style" school of thought, I like making life as easy as possible. I'm sure there's plenty of Rock cats who are killin' it on Roscoes, but it's going to take a more methodical selection of woods and electronics to really make it a stand out Rock bass. Otoh, to make a Spector sound like a rock bass, you pretty much just have to plug it in. My Dingwalls were great rock basses as well.
If I were playing Funk/Fusion/etc as my MAIN gig, I'd definitely say Roscoe/MTD would be the direction I'd go. If you are working in the Rock/Hard Rock/Metal genre, I'd say Spector/Dingwall with Spector maybe having a slight edge(I'd give the edge to Spector based on the fact that I see a few more options with electronics from them.). In fact, I was able to order my Spector Forte 5 with the Spector US 18v circuit(instead of the Aguilar OBP-2, which comes standard on the Forte line)which, ostensibly, turns it into an NS-5XL! I really did love the Dingwalls that I had. I had some shoulder and arm issues that made playing the extended scale length uncomfortable, otherwise, I'd probably still be playing them. The Roscoe I had was probably the most gorgeous bass I've ever owned. The problem was the Bartolini's were just too "polite" for what I do(pretty much the same issue I'm having with my Pedulla now). I can make them growl, but I really hafta dig in, and I really don't want to work that hard...
Bottom line is all of the basses on your poll are killer and I'm sure you'd be happy with any of them. Good luck!