i have a mix of 3in1's from pinballlife, and a bunch of everything from cointaker. i just experiment, and if something works that i don't have a supply of, i buy them. it's all personal taste, that's why i won't buy a premade kit.
cointaker is very good to work with DOAs, and i have not purchased enough from pinballlife to even have a DOA yet.
the 4+1s from cointaker are AWESOME in pop bumpers, but not yellow. yellow makes the pop bumper look aged, stick with reds, whites, and blues.
and as a side note, they say LEDs are cool. well, not the ultrabrights. those suckers will burn your hand, so use them carefully under inserts.