Only in Squad
First Solo then Squad
First Squad then Solo
None of them above
Owls are cute
First off, owls [i]are[/i] cute. For me personally it just depends on if friends are online. If not then I solo and if I can't succeed then I'll find a squad. Being alone definitely has some perks like you mentioned, but I prefer to be with friends usually.
Honestly... Any way that gets me loot. I hope to find treasure all on my own. I'll even do raids and strikes by myself if I can. But the second I hear or notice a group going near a location that I heard an exotic weapon or armor is waiting, I'll tag along.
Oh what? I'm in the minority haha. I like to go in as a group with randoms till I get the feeling of things, I then start going about on my own pace, so ill tend to solo later on. Who knows how ill do it in Destiny though