My nicest, most expensive one. I'm scared to death of it.
My other ones all get played, that one sits there getting dusty.
It was such a big deal when I got it, saved for a couple of years, that I've lost what was important about it and never play it.
I've got 11 that are electric or acoustic/electric. But the only pure acoustic I have is a round neck spider cone resonator. I'd put both mag and piezos on it but took them back off. Because it wanted me to. It's haunted. By Henry "Rufe" Johnson, the Union County Flash. I reckon that makes it different enough from the others.
I'd have to go with my acoustic (Martin 000-15) because the other two are electrics and both are PRS McCartys with the same pickups (Rio Grandes). So my acoustic is the "oddball" in that mix.
Most of my gtrs are basic US-made solidbody 50s rocknroll machines, the aluminium neck hollowbody Wandre Tri-Lam made in Italy c1963 is in another animal altogether. It stays in its case most of the time, but I'm hanging onto it.
For me it would be an older Ibanez 7 string that I got cheap and use solely for slide purposes. I tune it to open E, but then have that bottom added note for licks learned on open A (or G) tuning.
I have several nice semi-hollows, several variations of a telecaster, several nice archtops, and a MIM Strat that I acquired on a whim last year. The strat is kind of the red headed step child of the bunch, but an amusing change of pace on occasion.