There will be a few manufacturers of aftermarket sensors, but more brands than manufacturers, so what's in the box might be the same, at different prices. Even the OE brands will share sensors, to complete their range, but will always ensure high quality. Unless you know a brand, you have no idea what their quality is. Most of the cheaper brands go for 'adequate'.
Suggesting Ridex means you're looking at Autodoc, or one of their alternative websites, including BuyCarParts. There are others, but all are supplied from Germany, so take a week. And the delivery charge is high for simple items, easier to justify if you're buying a list.
Euro Car Parts seem to have high prices.
GSF, if there's one near you, have these:
https://www.gsfcarparts.com/parts/electrical-lighting/sensors/crankshaft-pulse-sensor
Intermotor is a good brand, that do work on their quality, and manufacture most of their branded stuff themselves. (Visited the factory, watched production, seen the R&D and testing of failed components)
Facet used to make just fuel pumps, but have expanded into other electrical stuff. no idea if they make their own stuff, but quality will be good. Your choice will depend on your wallet.
These guys are very good, well respected by many on here, including me.
https://www.shop4parts.co.uk/?name=store&op=Product&ProdID=3263
That's a Facet branded item, so they obviously are happy with the quality. Their delivery service is very good, so compare the total price, including delivery, with the cost of collecting one from your nearest GSF.