It really depends on your needs. The z87 vs z97 offer almost the same features with the exception of those who may need access to say things like M.2 ports and so on. Otherwise, they are pretty identical.
If you don't need anything of the features that are offered on the Z97 chipset, then it wouldn't make sense since performance wise, they are nearly identical.
Infact, I am still running a MSI Z87 MPower board for my test bench with a 4790k and a 4770k and the performance is pretty much the same.
But, aesthetically, the Z97 chipset boards do tend to be better looking if that is what your going for.
My other question wound be why do you want to change? have you hit a limitation factor with your board? Something you want that you don't have?
Those can be the major determining factors.