Well there's a quandry! Our personal choice would be to go with the Indie based on the fact that the two indies that we have used give a very concise and thorough whats-what of the car, over and above doing the service, whereas main dealer can be a bit "tick boxy".
The free collection/delivery wouldn't sway us as we like to know whose been behind the wheel, so we deliver and collect. Likewise the free valet, just in case somebody decides to use a sponge/leather/cloth which isn't quite up to scratch (no pun intended!).
The price difference is negligible. We agree with Joe/Lazlo etc ref doing your own work, but it is often the case, certainly for us, that our days of crawling around underneath are past. My partner once removed the 4.2 XK lump from his XJ6 (some 20+ years ago now), stripped it completely and successfully rebuilt, whilst I indulged in a complete rebuild of one of my Gilberns back in the day.
Whatever, happy growling will be the order of the day