Boat wise its pretty much a wash. Engine wise, Yamaha hands down. The 2.6L HPDI is one of the most reliable motors out there.
The 2012 TZX originally did not come with a jack plate. You will want a 6" on there to keep the motor off the cables when titled all the way up.
The Skeeter can fit 8' rods in either rod locker.

In 2012 I crawled all over the Nitro Z7, Skeeter TZX190 and ZX190, a Ranger 118 and a Triton 18XS.
My order of choice:
Skeeter ZX190 - bought this one of course
Ranger 118
Skeeter TZX190
Nitro Z7
Triton 18XS

This was a feature for feature comparison, max HP (for this model year only the Skeeters offered 175HP), price, storage, dealer proximity.
With a 150 the Nitro maybe 2 MPH faster. For this model year the Skeeters were much better quality. Equally decked out the Skeeter TZX190 was actually cheaper than the Nitro. The ZX190 was about the same price as the Nitro.

For what my option is worth I'd go with the Skeeter but I don't think either sounds like a bad deal.

I might base it on maintenance, were the Skeeter is older and if it wasn't maintained well that could be deal breaker and the Z7 is younger so poor or lack of maintenance wouldn't be as big deal.

Thanks for the reply, i no the tzx is the budget model of the zx but the price seems pretty good, just out of curiosity why was the triton 18xs so far down the list?

Like Skeeter and Ranger, Triton had two different price point boats. This was the lower end package. To me they cut too much out of it with far fewer creature comforts and it was a 150.

I misread your original post. I thought both were 2012s. At that price the Nitro looks to be a better deal. I believe the 2015 Z7s are rated at 175hp, just means that the transom maybe stronger on the 2015.

my 2010 was rated for 200

Like Skeeter and Ranger, Triton had two different price point boats. This was the lower end package. To me they cut too much out of it with far fewer creature comforts and it was a 150.

I misread your original post. I thought both were 2012s. At that price the Nitro looks to be a better deal. I believe the 2015 Z7s are rated at 175hp, just means that the transom maybe stronger on the 2015.