Epson V600 is what i recommend for flatbed if you can swing the cost. ADF the best are Fujitsu imo... 7140 work for debinded/cut magazines under A3 and can be won on Ebay for not too bad a price. A3 or stapled mags without cutting will required a 7460 which is what I personally use but they go for about $1k used.
Unfortunately looks like the 7000 series is about to be dropped as the 8000 is coming out now and they don't seem to have an A3 model announced yet and they are CIS instead of CCD. Supposedly the tech in them will be "better" than CCD but I want to test it myself first.
There are other options you can buy used as well, some are recommended on the guide I helped write at - https://scanning.guide/
If you have any questions just DM me, i'll try to remember to check the thread too.