If you were in this situation what would YOU do? buy a good brand low budget 2070 or buy good brand high budget 2070?Completely agreed with 13thmonkey - the difference between them will be negligible in reality.
I tend to find that picking a GPU often comes down to budget, cooling and aesthetics. Most reputable cards (Gigabyte, MSI, ASUS etc.). all have good cooling solutions usually. If you get the one that fits your budget and you like aesthetically, you won't really go wrong IMO.
If you're going to spend a lot more money to get a specialised OC version of a card, you may as well spend more and get the next card up.