The DeadSmurf

I'm slowly acquiring the parts for my UNRAID build and need recommendations on a rack case. I have a smaller (4 bay) Silverstone case and really like the quality of it but it seems that they only offer a 20 Bay unit. I found these 2 on Amazon and they seem like the exact case however one is over $200 more. Are these indeed the same case just one seller wants more or do they just appear to be the same. Can someone point me to the case they are using and what you like about it. I have no problem paying for a quality product as I plan to use it fro awhile. https://www.amazon.com/RROYJJ-Rackmount-Server-Chassis-Hot-Swappable/dp/B095YMXW1K/?_encoding=UTF8&pd_rd_w=F45ie&content-id=amzn1.sym.a42143f3-41b4-441e-ab4b-4cb8bc510702%3Aamzn1.symc.43e4e477-9c69-4a02-84f5-6da0b435879b&pf_rd_p=a42143f3-41b4-441e-ab4b-4cb8bc510702&pf_rd_r=NSQ3M4A25GFH9DDXVFA2&pd_rd_wg=b0lLj&pd_rd_r=1d25b08b-cd70-4b6c-a650-91220c0ea89d&ref_=pd_hp_d_atf_ci_mcx_mr_hp_atf_m https://www.amazon.com/KCMconmey-Rackmount-Chassis-Backplane-Redundant/dp/B0CPP4CDXS/?_encoding=UTF8&pd_rd_w=F45ie&content-id=amzn1.sym.a42143f3-41b4-441e-ab4b-4cb8bc510702%3Aamzn1.symc.43e4e477-9c69-4a02-84f5-6da0b435879b&pf_rd_p=a42143f3-41b4-441e-ab4b-4cb8bc510702&pf_rd_r=NSQ3M4A25GFH9DDXVFA2&pd_rd_wg=b0lLj&pd_rd_r=1d25b08b-cd70-4b6c-a650-91220c0ea89d&ref_=pd_hp_d_atf_ci_mcx_mr_hp_atf_m&th=1

O am I correct in thinking that if I create a Btrfs pool on my array I would be OK? I just have several SSDs not in use and was wanting to put them to use

So does the btrfs pool do the trim or am I just out of luck?

I currently have a Synology NAS that is used for all my mass storage. I was looking at standing up an UNRAID server mainly to use the apps, dockers, etc features. Is there any disadvantage of using creating a pool with all SSDs? I have several that were purchased for another project that never panned out. Thanks