you'll get 70W more max power from PSU (which actually doesn't matter since you're running GTX 1050 Ti
That’s a pointless argument because
1. The 12v is what matters, the M12ii 520 only has 30w more on the rail.
2. OP’s System won’t come close to 450W. If it did it would be caused by a fault which is where the CX has an advantage.
3. There are way more important difference that one should be focusing on.
The M12ii has lesser electrical performance, therefore decreased component lifespan. No support Haswell c6/c7 sleep states. Higher risk of instability (but unlikely with this system)
And the M12ii lacks many protections - no OCP at all, no UVP on 12v rail, no OTP. This is why the CX has an advantage in a fault.
The M12ii is comparable to the EVGA BT, priced way down at $25. $55 for the M12ii is just silly, when you can find the Corsair CX / CXM for a similar price.
Or, the Bitfenix Whisper / Formula. Both are top quality power supplies. The formula is non-modular, however. These are my recommendation if in the US.
https://pcpartpicker.com/products/compare/cg4NnQ,jfs8TW,zBfmP6/