It depends on the legs and terrain it will be used on. Of the options I see for Deore (38/24, 38/26 and 40/28) I would go with 38/24.

I have used 2x10 with 39/26 and 38/24, not a night and day difference but the 38/24 is a bit easier on the legs. 40/28 is a race setup.

I haven't really used a triple in years. And when I did, the big ring was mostly a bashguard. Meaning, I never really used the big ring.