If you find a good deal on the 2015 iPhone 6s, then sure. If you look at the Android side, the 6s is faster than current midrange Android smartphones. I believe it's even comparable to high end Android flagships from 2016.
If I find an unlocked 6s 32+GB for $300 or less, I'll likely get one as travel and backup phone.
If I find an unlocked 6s 32+GB for $300 or less, I'll likely get one as travel and backup phone.