Mine wouldn't be an airliner as you lose out on VFR for which I have a big scenery investment.
The littlies on the other hand are too slow, and I find my attention wanders.
Naki the SF260 is a good choice but it was my default a/c for so long I got used to it.
Terrible thing, and now I'm saving it for a rainy day.
But this one can pretend it's an airliner, or do short field stuff, neighbourhood hops, anything.

It's the Aeroworx Super King Air B200, and it's a seriously competent model too.
Strangely I seldom fly it, as there are many aircraft more suited to specific things I'd want at that moment.
But it's the
one