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I generally decide based on which features I value more. Do I want the best resale value? Quickest turn time? Easiest process? Once I decide what means the most to me, thats when I will select one. For me personally, I use PSA just because they have the highest re-sale value and 99% of my collection is already PSA. A case can be made for other companies like SGC if maybe you just want it slabbed for your PC or if you want them back in hand ASAP to flip. SCG is also really good for vintage cards so submitting to them might make more sense for those kind of items. A lot of people will use BGS to chase black labels which is not an option for other companies. Everyone will have their own opinion here on what works best for them.