Should i keep my Sony xperia xa ultra or get an s6 or 7 edge?

[FireCobra15]

I've had my xperia xa ultra for about 2 months now, it's a good phone but as I now have more money I don't know whether I should swap it and get something like a second hand Samsung galaxy s6 or s7 edge? Bit of a random question but I really don't know???