Would like some advice on this. Does it matter? What are the big options?

I was in the same position a few weeks ago, contemplated the Performa HMX, but went with some Hobbywing G2s. Hobbwing produces for other manufacturers, too, and know what they are doing. You don't have to worry about reverse polarity (except for the standard capacitator, but rp proof options are available) Their mobile app is the best out there, and while I only was able to bench test so far, this esc feels better than the Muchmore, Tekin and Grauper(=Yokomo/R1Wurks) stuff I had in the last few years. Orca might also been an option, but I don't know anyone who has had one before.

+1 for HobbyWing, their stuff tends to stand the test of time... I have also found that they offer deep discounts on any damaged ESC outside of warranty, including really old discontinued ESC's too!

The feeling does not come from the 32 or 64 bit, it is just the software.

32 or 64 bit? Well, these little microprocessors can be found in everyday devices, the devellopment is huge and logical as with computers we do see evolution on evolution. Does that make 16 or 32 bit bad? No!

Do not get fooled that more is better.

Didn't realize 64bit ESCs existed. 32bit just recently started appearing.

Unless the ESC has more than 4GB of addressable memory I don't see why they'd need anything more than 32bit.

There is some confusion about adres and data lines. In this case it is the data bus that can handle numbers of 32 bit and with that also higher resolution D/A and A/D converters.

Nice example is the difference between the STM8 and the STM32 processor. The STM is a cheap, small but still a powerful 8 bit processor with integrated 8 bit A/D D/A converters etc. The STM32 has 12 bit D/A and A/D converters.