Some of the blends are outrageous. There's one popular blend that makes sense. GP Test 400. It's Test C 200mg/ml and Test E 200mg/ml.
This is exactly the kind of blend I like. Never tried the GP one (are we even allowed to talk about lab names here?), but my source has one with the same amount of c and e per ml, is cheaper than buying the same amount of test separately, doesn't give any pip, flows nicely through thing needles and definitely appears to be accurately dosed (judging by the effects anyway). So I really see no reason not to use it. Also has some test 500 with 200mg c, 100mg e and 200mg d per ml which is even cheaper per ml, only did a few shots so far, so I can't comment on effects, but there is no pip and it flows nicely through thin needles which is also good.
I tried prop once (got a free vial and thought what the hell, why not). Not something for me, frequent injections, left painful bumps and if I wanted any meaningful amount I'd need to inject huge amounts. No thanks.
Anyway, as far as I'm concerned long estered test at high doses + ai = best, cheap, effective, doesn't give me any sides (well ok, a little bloat above 1g per week). There are a few others that I also like, but they are either expensive (anavar + test is great if you can afford it) or have sides that I hate (tren, deca - I kinde like my sleep(yes, deca also gives me insomnia)) or are something you can't take for long (dbol (back pumps get crazy after a few weeks), mtren (don't hate my liver that much). Never tried anadrol but would like to at least once, online opinion seems split between toxic piece of crap and turns you in to the hulk over night. Oh yeah, and test-1-cyp, that's something it like to try too, supposed to be kinda like tren with less sides.