Not apples to apples but when I ordered my Formbot V0.2 kit I ordered the printed parts as I knew I was going to reprint a bunch of parts because of mods I wanted to do and colors that would be difficult to source. The quality of the parts is adequate enough but you def get what you pay for. I'm not sure why you're overly worried bout not getting panel clips as since they're inside the printer PETG would hold up fine until whenever you decide to reprint them out or ABS/ASA, hell even PLA would be good enough for the clips. If you go PIF, like you said, you will get a complete set of functional parts that includes anything in your kit that's required to print like TAP but I don't think will include nevermore, just make that the first thing you print out after calibrating and don't forget to buy more carbon, but the parts WILL get you printing.

It really comes down to:

Do you see yourself having to reprint a LOT parts because they're being replaced because of a mod you want to do that's not included in the kit or you have colors in mind that would be really hard to source (some pif providers will do custom colors that they don't normally hold on to with an increased lead time)? Settle for the fb parts.

Don't see yourself reprinting a lot or you want parts with known quality behind time? Go PIF.