I base it on how soloable the strike is, are there safe(ish) spots I can duck in or do I absolutely have to have other people. Like the Nexus, I can usually solo up to the Nexus itself no problem, but between the minotaur up top and I'm not good at getting into the safe spots down below (the jumps are just hinky), so I usually solo up to the Nexus and then post on LFG for a team. People love to come in at that point. Summoning pits has the shrieker room Devil's lair has the little room to the left (assuming you don't have idiot teammates standing outside the main door, when they do that a captain spawns in that room right on top of you.) Archon has the ledge (I always die trying to get under the platform) Risky but doable. Cerberus has a few good spots, you just have to watch for a Phalanx trying to melee you through the crates (I always die on top of the lights) Omnigul has that little room across the way, which can save you from the cursed thralls, but its really easy to get hung up on the junk pile and not make it back on top. So this is another I tend to solo to the boss and then bring in backup. So probably 60 Omnigul 40 Nexus (you could feasibly hide behind the wall and be super careful)