Theoretically better because you lessen the chance where audio skips can happen due to bandwidth. Other features like ARC/eARC may also work better.

Realistically though, as long as you get the proper HDMI cable - you wouldn't notice a difference as far as audio or visual quality goes. But of course there's someone else here who would tell you otherwise.

Did you manage to connect to make it work ?

cross over at AVR or Subwoofer? which avr u r using?
i set mine at 80hz

The setting of the crossover is inside the menu. You can set crossover for example the front, the center, the surround, the back surround.
Can set it all different crossover even.

You're mistaken and confused.

If you are using your AVR to digitally bass manage (i.e setting crossover), then you "disable" the crossover on the sub's plate amp by setting it to LFE or the highest setting it would go (usually 240hz if there is no LFE setting).

Then within your AVR, you select whatever crossover best fits your room and your other speakers. 80hz is a good starting point, but feel free to experiment.

You need to bring the unit back to Yamaha service center to reflash if you want to downgrade