Here is alignment of Aruba Instant On with Ubiquiti APs, researched to the best of my abilities.
AIO Best Offer
Ubiquiti Lite (UAP-AC-Lite)
Both 2x2:2. AP11 is Wave 2.
Ubiquiti AC In Wall (UAP-AC-IW)
Both 2x2:2. AP11D is Wave 2 and comes with desk stand and in-wall mount
Ubiquiti LR (UAP-AC-LR)
LR is 2x2:2 on 5GHz and 3x3:3 on 2.4GHz.
AP12 is 3x3:3 both bands, so better performance on 5GHz which is where you want it.
Ubiquiti Pro (UAP-AC-PRO)
Both 3x3:3. AP12 is Wave 2
Ubiquiti NanoHD (UAP-NANO-HD)
Both 4x4:4 Wave 2
Ubiquiti M (UAP-AC-M)
Ubiquiti M-Pro (UAP-AC-M-Pro)
AIO AP17 (outdoor)
All AIO models (including those above) support Smart Mesh, allowing extending connections wirelessly to another AP. AP17 models are all weather outdoor APs.