Blockout has usually the best setting, SOLO Minimes the worst. SOLO L'union is quite old school.
Altissimo's business plan (both walls) is to have zero costs, so no fancy setting and no cleaning of holds. SOLO is a bit similar in this aspect but has a much bigger wall, so generally better I'd say.
I haven't been to La Ô in several years, but they used to have very good setting and really hard median difficulty. I haven't been to Starting Block in a long time either, but it used to be good.
Overall I recommend Block'out. It is quite expensive though, but I find it worth it even on a French salary.
If the weather continues to be this horrible I'll probably go to the Block'out on Thursday