Go to Asus website, select model, click Compare (bottom right corner of product picture). You can compare up to 4 models.
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Asus model numbers are mostly upgrade suggestions like AC88U -> AX88U -> AX88U Pro, AC86U -> AX86U -> AX86U Pro, etc. or contain class number RT-AX3000, GT-AX6000, GT-AX11000, etc. They don't show release date or what hardware is inside. You have to look at specifications. Software options? Most popular Asus routers run Asuswrt firmware. What's included is listed in specifications (sometimes with copy/paste bugs or incomplete, unfortunately). If you are interested in Asuswrt-Merlin firmware the list of supported models is here:
www.asuswrt-merlin.net
Yes- I've been using that all day. But, for example, it's not clear that the AX92U is meant to be sold/set up on pairs, to leverage ASUS mesh. The technical specs are there. If you're assuming that the average Joe can look at that website, understand the options, and get a sense of what they need- no, that's not there. The difference between the RT-AX86S, 86U, and 86U pro is not, actually, easy to do in that tool because some of those are not available in the results. Again- even if I knew to search for those models, and got the tool to compare them, it's not clear which is better.
I've was told unconditionally bu Asus support that the Pro is better. But AFAIK, it's only a small bump up in processor and an updated port? I read the 86U is better than the 88, except for the sites that say it didn't matter. And one site said the 88 has better range, but I'm dubious; looks like the same power, but it is a different antenna config, so performance is different, but not "the same better" for WiFi 6.
I've done enough balls-deep reading up on this morass today that I can tell you, as a pretty technical guy, they have too much $hit and it's confusing.
I'm suggesting that what you think is "obvious" isn't obvious to everyone. And to say that, actually, it comes across as a bit condescending.
If telling you something is insulting insults you, I'm sorry, I don't mean that at all. I spent the day picking one and can say with certainty, nothing about it is Obvious. I mean- even the comments in this thread show it seems to be unclear. Or, rather, even worse, uncertain.