...gritty realism with lifestyle rest mechanics works well for me: reins in both five-minute adventuring days and five-week adventuring careers but, rather than playing mother-may-i with the DM, players retain full agency over where and how they rest, with sufficient granularity for their choices to matter...
WRETCHED - No rest benefits.
SQUALID - Staves Exhaustion only.
POOR - Short Rests only.
MODEST - Standard Long Rests (half hit-dice).
COMFORTABLE - Long Rests + all hit-dice.
WEALTHY - Half-duration Long Rests + all hit-dice.
ARISTROCRATIC - Wealthy Long Rest + Inspiration.
...another version i've read keeps long rests a consistent duration but gives inspiration for wealthy rests and adds (character level) temporary hit points for aristocratic rests...in either case, it couples well with slow natural healing if you want to cultivate a lot of campaign downtime...