Well, it might help then to tells us what country and the on-line retailers you can buy from.
That said, while I happen to like Fractal Design fans, I would not worry too much about the brand. Most brands provide a large selection and not all are of the same quality.
You have picked out your size and that is good. And 140mm is a good size because it is big. And larger fans can move more air while spinning at a lower speed than most smaller fans. That typically means they make less noise too.
So you need to look at the available fans in your area. Rotation speeds really don't mean much. What you need to look at is CFM (cubic feet per minute). That tells you how much air the fan moves. The bigger the number, the more air. If the fan specs are listed in cubic meters per hour,
here's a handy converter.
The second specification you need to look at is dBa (A-weighted decibel) value. The lower the number, the quieter the fan. So you need to find a balance you are comfortable with, in the price range of your budget.
I would not worry about bearing type either. For one, there are too many. These include sleeve, ball, fluid, rifle and more. Some will tell you to get ball because they last longer. Others say sleeve because they are quieter. Others say fluid is the only way to go. The thing is, it is really the quality of the bearing(s) that matter, not the type. Frankly, I cannot remember the last time I had a case fan fail before it was at least 7 years old!
The last thing to look at is the connector. They typically come with 2, 3 or 4 pins. 3-pin are most common for case fans.
I cannot say which is best, but in addition to Fractal Design, popular brands are Cooler Master, Arctic, Noctua, be quiet!, ThermalTake and more. Higher cost does not necessarily mean better. I never buy the most expensive, but I avoid the cheapest too.
Fancy LED lighting, to me, is unnecessary. While some like it, I see them as distracting and IMO, a case should sit discreetly and quietly off to the side and NOT draw attention to itself. After all, its what's on the monitor(s) that matters. Besides, fancy lighting does nothing for performance, creates some (even if tiny) heat, consumes some (even if tiny) power, and does nothing for performance - worth repeating!