Many 2013 S models are quickly approaching their battery warranty termination date at this point. So, at best, you might get 6 months of remaining battery pack warranty - better than nothing, but really only useful to someone taking a gamble on a 9 bar LEAF dropping to 8 bars in the nick of time.
So, I would buy a 12 bar LEAF with 50k miles on it over an 11 bar LEAF with 25k miles on it (all other things being equal), since neither one is going to get you a replacement battery pack and the higher mileage LEAF is likely to be considerably less expensive.
Wait, that's exactly what I did already
My 2013 SV +QC was purchased with 46k miles on it and with an SOH of 92%. It's now got 65k miles on it and still has an SOH of 88%. I was lucky enough to get it for $8k - haven't seen a similar deal since. So, higher mileage 2013 LEAFs with healthy batteries are a bit of a unicorn, but there are still a few out there.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV