Raystech is a south African manufactue and have sole UK partner is ECO Energy Storage Systems Ltd. They have potentally rebadege CFE batteries but, use a cheaper BMS.
They aren’t that common in the UK and advise you do your research on reviews.
Dyness is a Chinese company based in Shaanxi China. which formed in 2017 from a breakup partnership with Pylontech (China) don’t gett hooked up on the China bit, as most cells come from here. I wouldn’t say there hugely popular in the UK but again do your research prior.
Given there aren’t many reviews or much spoke about in forums in the UK of these, you may find forums like powerforum.co.za usefull.
With Fogstar you can trace back to the cell manufacturer and Fogstar also provide links for you to do so. Fogstar state 8000 cycles at 200A. This information isn’t readily available (maybe I’m blind) on the above spec sheets but, if it turns out they are quoting 16,000 cycles at 100A, then thats the same 8000 cycles at 200A!!. The other good thing with Fogstar, you are dealing directly with the import supplier.
Do your homework fully, on the makes you mention and come to own decision and not talked into it by the installer.