For me, only 2 types of places seem worth using for servicing;
1) Main dealer, preferable, paper trail, proper digital history updated. Mega expensive with some brands and therefore often not worth it against any residual gain.
2) Proper specialist, as in a real one who are known well and who a likely buyer will have heard of. They'll have main dealer grade equipment and only work on that marque and to main agent standards, not a back street place which claims to specialise.
Everywhere else i just see no value in using whatsoever (in fact, negative value, as they likely wont use OEM parts, you get a naff off brand receipt, and you will need to wait around at a garage). Personally I buy the parts from the main dealer, with a headed main dealer receipt filled with the cars mileage and VIN detail, etc. This then at least looks fairly nice in the SH, to have a big wad of matching branded receipts from the local main dealer.