Charge Controller/Inverter-Charger/Monitor Brands
Ed, let me first praise Logan's observations. Many YT channels are being monetized by full-timers who support high computer use and, for them, perhaps a big investment is warranted. Even our good buddy and mentor here, Ray, falls into that category. But do appraise your own needs thoughtfully as what appears to be 'the best' or a 'norm' is simply not needed by most of us. And as one example, we lived for most of 11 years on the hook and off the grid while cruising our sailboat, and while we had a more sophisticated monitor/charger/inverter system than one sees today in RV's, the *only* source of our electricity - just as with all RVs who are away from RV parks - was a house bank, specifically as group of simple wet cell Trojan T-105's. So far we have camped down to single digit (F) temps with our wet cells (note the temp charging limits on Lithium batteries), rarely use our EU2200 because of 290W of solar (small by YT channel standards) and have yet to dip below 85%. Almost every RV has a vented battery compartment (and so exposed to outside temps), so "just" swapping out the batteries can become a "relocating" the batteries and wiring. Never going to be in cold country? If you're buying an RV, it would be a shame to exclude the wanderlust that comes with it. ;)
Greg is spot-on about the depth and cleverness of the Victron product line. I installed their 712 bluetooth monitor and a Victron controller for the portable panel(s), and really appreciate using the iPhone to observe all the panels' performance. (With this capability, you can ignore how to run the data wire and where to mount the display, which can be an install hassle). However, I don't find Victron (the company) all that easy to work with when seeking info beyond the manuals (which are excellent) so a knowledgeable U.S. reseller might be a good idea vs. Amazon et al.. I also viewed a YT video just a few days ago that featured a very disappointed Victron controller owner who, when switching to Lithium batteries, found them incompatible, so double check that.
Good luck to you. Just remember that, when it comes to electrical systems, it isn't about a 'best' choice but rather a 'most suitable' one.