If you mean fit and forget. . .
The love list:
Mavic 721 rims – indestructible, not too heavy, never have to worry about them.
WTB saddles – simple, get on with the job, strong.
SLX brakes – super cheap, plenty strong, good for ages if you don’t faff with them.
Rock’n’roll blue – lasts, clean, especially good in sandy areas.
Finish line carbon paste – excellent for dodgy seat-tubes like ragley
Hope seatpost clamps – nice looking, good brass bushing
Shorts – Race face for baggies [e.g. Ambush], Endura for liners.
XT derailleurs and shifters: My nine-speed has worked every time, first time for 6 years. Zero maintenance.
The hate list:
Sram brakes, especially Elixirs. Both died on a hire bike in Gran Canaria this week. Walked 12K down a road as had no brakes. Unacceptable.
Salsa seat-clamps: No bushing, small allen key rather than finger tip barrel adjuster.
Tioga tyres: Washed out on me several times, especially poor on hard, wet surfaces.
SKS mud-guards: Not fit for purpose. Bin.