I have the Discover IT, and it's great if you use it for the 5% back categories, especially for that first year. Right now I'm getting 5% plus 5% back at Amazon and Home Improvement stores. That's not bad! There are lots of other little deals and things, like extra cash back if you buy things through their portal, etc. For example, I bought a sewing machine from Bed Bath and Beyond through the Discover portal and got 5% + 5% back, IIRC.
They had an amazing deal at the end of last year where you got 10% back (plus 10% at the end of the year) on anything you bought with ApplePay - that's why we originally signed up for the card (my oldest card is also a Discover, so I just opened up a new one, which was very weird). The grocery stores we go to take ApplePay, so we stocked up on food and booze at the end of the year to the tune of 20% off! We only just ran out of olive oil. I also bought a new iPhone (unnecessary but much-wanted), again with 20% cashback.
I doubt they'll do that one again, though.
Discover is a little weird compared to some other credit card companies - like, if you add an additional user, their card has the same number as your card, which I don't love. They're more widely accepted than they used to be but still pretty useless for travel outside of North America, and they don't have as many perks as the fancy cards. But for that first year in the 5% categories it's really great (and the categories are announced in advance and pretty predictable, so you can plan your spending pretty easily).