RI, TPS, and element stays only earn Bonvoy point at half the usual rate. Is this true also for Hilton family extended stay properties? That could be a major plus for the OP.

OTOH Starriott guarantees the 4 pm late checkout (except at resort and convention hotels), while at Hilton it's on request based on availability and one is unlikely to get more than an extra hour or two, so you can't plan ahead to not get up so early and check out after a meeting or to take a shower and change clothes before going to the airport.

I think the Bonvoy T&Cs are more explicit about entitlement to upgrades including suites and don't require Diamond level status for lounge access.