I process 35mm C41 at Costco. They do a great job.
120, 127, 126 and black and white I process myself. Not as good but very cost efficient.
I had some 120 and 127 professionally processed at high prices and it was 'barely' better than when I do it myself. This was at two different quality labs.
None of the places I have used print optically from the negative so I am at the mercy of their proficiency with an electronic enlarger and all that implies.