I found the RTX 307TI graphics card but I don't know which brand to choose, ASUS, MSI, ZOTAC
it's RTX 3070 Ti.
if you're buying new, move on to the RTX 4000 series. for a similar, or even same price in some cases, you can get a newer card with more performance & often less power usage.
the brand name itself doesn't really matter as much as the design of the cooler and the warranty offered with them.
most brands offer a different variety of cooling options;
dual fan, tri fan, blower fan, different array & amount of heatsink & pipes.
some cards shorter and slimmer for smaller builds, some longer and taking up 2-3 PCIe slots.