got both, whichever you pick, you will be happy, but here is my advice:
pick 10-24 if:
- you take a lot of shots as a tourist
- you travel with friends, and are active
- you take some videos (VR)
- you want to shoot ultrawide (tight indoors, funky perspective)
pick 16 if:
- this lens has great rendering and bokeh for a 24 equiv, so taking portraits is an option, especially if you got kids
- you often take pics at low light, or indoors
- you want to experiment with astro (not perfect lens for that, but it does the job)
- you travel with a tripod, alone or with someone that will let you take your time to compose frames with your feet
I've had 10-24 first, picked up 16 later on. I never take them both when I'm out shooting, rather pick the one that will suit conditions better. Not planning on selling either.
If I had to choose between the two.. hmm.. maybe the 16, but I just got my xt2 and plan to shoot more video with it, so things may change.
IMO just get the one that you can get cheaper and used in good condition.
some shots with 10-24: https://evgreen.exposure.co/maras-kaleidoscope