Unless you're looking at a very narrow time period, brand says very little. Consider that brand names get different ODMs to make their laptops (eg. Dell's consumer line and business lines come from completely different factories & designs), and WiFi is such an afterthought (last year there were STILL high-end gaming laptops being sold with 2.4GHz-only 1x1 SISO WiFi-n, because almost no-one buying even bothers to look) it really depends on the engineer doing it and whether anything else was deemed more important.
There are a few specific models worth mentioning; the MacBook Pro 'Retina' series with WiFi-ac (2013-2016) is generally considered to have the best WiFi implementation in a laptop. I certainly haven't found a better one and that's not for lack of trying.
However if you are looking for a PC laptop, unless someone who actually knows about WiFi has done a comparative review (almost never happens), you don't have a clue.
But...
These days the antenna design of most laptops is pretty standard, two dualband antennae somewhere behind the TFT screen. What differs a lot more is the card that it's connected to. A lot of laptops come with SISO 1X2 NICs. Replacing that with a 2x2 MIMO NIC will double performance. Thing to watch for - and this is brand-related - is that some brands use nasty BIOS whitelists; Lenovo and HP are pretty notorious.
If you want to upgrade the thing to watch is interface (mPCIe vs M.2) and antenna connection (Hirose u.FL vs w.FL). In general M.2 always uses w.FL.
I've upgraded all my laptops to WIFi-6, in one case WiFi-6E. The newer ones have M.2 connectors and I've just used native Intel AX200 NICs. The older one (Lenovo x220 with custom BIOS with whitelist removed) had mPCIe. I used a mPCIe -> M.2 adapter and added an AX210, so my 2011 laptop now has 6GHz support (shame I don't have a matching AP yet...)