I'm glad to help where I can.
That means the RX 6750 XT is 17% more expensive than the RX 6700 XT but only 8% faster and with the same 12GB of VRAM.
If I were you, I'd choose the RX 6700 XT because while 8% isn't nothing, it's small enough that the biggest difference that it could make would be at the end of the card's life. You wouldn't notice an 8% difference during most of the card's lifetime, especially if your monitor is only 60Hz (like most monitors are).
Take it from someone who has owned cards by Albatron, XFX, Sapphire, Palit, Powercolor and Gigabyte... They're all more or less the same. They all know how to make video cards and they've been doing it for years. Just get whichever brand offers you the best price. If you can get a 3-fan model for like $10 more, I would get the 3-fan model because it makes much better use of your Full Tower case. However, if they want like $25 or $30 more, I would stick with the 2-fan card because that's getting too steep.
After having the card for a month or two, you'd become accustomed to any noise it makes and you wouldn't even notice anymore. As for temps, as long as they're within spec, it won't matter.
I'm sure that it's fine. You have to remember that base model cards like the Powercolor Fighter, the Gigabyte Eagle and the ASRock Challenger are rarely reviewed because these manufacturers want the reviewers to review their flagship-level models so that's what reviewers get sent. They want people to see the flashy Red Devil, AORUS and Phantom Gaming D cards.
The Powercolor Fighter model has been around for years and I've never heard anything bad about it. I know that it's a pretty plain-looking card:
but who cares if it's inside your case anyway? Powercolor has made Radeons for close to 20 years and they know what they're doing. I actually chose to get a Powercolor RX 6500 XT ITX card which looks like a single-fan version of the Powercolor Fighter:
When cards have simple and plain designs like this, they're able to make them more cheaply while still maintaining full functionality. When you buy a fancy card, some of the money you're spending on it is for those fancy shrouds and RGB lighting while a simple card only charges you for what it can do. That RX 6500 XT that I bought is for my mother's HTPC. Since she doesn't game but just browses and watches videos, even a single-fan card is ideal for her because 90%+ of the heat and power consumption in a video card these days come from their 3D gaming accelerators. Cards that are only used for 2D video can still get away with being only passively-cooled.
The only significant differences between a 2-fan and a 3-fan model are that the 3 fans can cool while spinning more slowly so it does make them a bit quieter. They also have a greater cooling upside because of the 3 fans so they're better for overclocking. At stock settings though, they perform about the same as a 2-fan card.
Many people actively seek 2-fan cards over 3-fan cards because 3-fan cards are BIG and don't fit in a lot of PC cases. You have a full tower case which means that you can fit a triple-fan card easily but it's not a requirement. Full Tower Cases have a lot of air in them and a lot of space for unrestricted airflow. You'd be perfectly fine with either a 2-fan or a 3-fan card. If the Powercolor Fighter offers you the best price by a good amount, just get that.
Just remember that the brand-name is irrelevant because they all offer a warranty and stand behind their products.