Makita are my favourite. Lovely compact and ergonomic grinder that fits my hand. Also it's not long so can get into tight spaces with it. Light and compact so easy to use one handed also. Not broken one yet is the main thing. If you shop around you can get them cheaper: https://www.screwfix.com/p/makita-ga4530r-720w-4-angle-grinder-240v/5538k
I'd recommend having a look and feel of them before buying.
Lots of good brands but your thinking is probably as good as grinders get. Metabo would defo be my first choice for either corded or cordless.I am thinking between a metabo
you might want to check the label on your Hitachi - I’ve got Bosch and Hitachi and mine are both made in ChinaI use Hitachi, have something like 8 x 9" and at least 10x 41/2" again Hitachi........will never buy Bosch again......look at the label, Chinese rubbish.........
go look at Screwfix, the last time I looked u could get a 9 and 4'1/2 Hitachi combo pack for around £85..........thats where mine came from........I bought 15box's and sold the surplus for a small profit to help pay for mine.......
have a lot of Metabo but all 110volt, anther excellent brand........
Frank