If you want decent enough supermarket coffee; Lazy Sunday from Taylors is good enough for most folks I’ve found.

Beyond that coffee can be like wine with a huge variety of tastes and preferences. If you want to start deep diving then a local coffee shop running a tasting (cupping) session is a good idea.

pre-edit, if I’ve misunderstood the question, sorry

The biggest problem with buying ground coffee is how quickly it goes stale, especially with how many weeks/months it’s been sat in its packet for outside of climate control, after it has been roasted and ground.

My recommendation is get a decent, electric, ceramic burr grinder with adjustable grind.

Something like this: https://www.therange.co.uk/cooking-and-dining/food-preparation-and-utensils/salt-and-pepper-grinders/grinders/la-cafetire-electric-ceramic-burr-coffee-grinder#2884794

(this is a suggestion, not a recommendation of brand or specific product as I haven’t used that one)

Whole roasted beans will go stale still but it’s a time scale of months rather than a couple of days.

As for specific coffee, your best experience will be from someone as local as possible who does small batch roasting, it’s something that really benefits from as small a time as possible from being roasted to being ground and brewed. Experiment with a few different blends and roasting profiles to find one you like.

I highly recommend this little book by Lani Kingston https://www.worldofbooks.com/en-gb/products/how-to-make-coffee-book-lani-kingston-9781782405184

That goes into the details of different grinding, brewing and drinking styles and it’s tiny and very nicely written and illustrated.