There will not be an audible difference for a daily driver no matter which way you face the port. If you were competing and chasing that last single decibel then having a test box and trying different directions may pay off. I would do what is going to be easiest to build personally.
You should be good on power with that amp. The smaller the enclosure the more power the subs will handle. SO if the box ends up a little undersized you’ll be OK. You’ll easily be able to push the subs to their mechanical limits, which is the most output your going to get from the cone moving. The smaller box will not hurt you also in the fact that it will make the tuning frequency have a little more output out of the port. Basically a narrower response but with a higher peak.
Here is an example of how one gentleman on here did his port side firing.