The 100 Girlfriends Who Really, Really, Really, Really, Really Love You
I'm not usually the type of guy to enjoy harem comedies, but 100kanojo makes it so damn easy. The first thing that really smoothed the read for me is the main male character, Rentarou. He's the harem's protagonist, and I love him. Why? Because unlike most harem protagonists, he truly expresses joy when in the company of the harem, and not just because he's horny. Rentarou is a lovable idiot, whose earnest adoration for each of his girlfriends is so apparent you can feel it through the page. Of course, being a harem comedy that proclaims it's going to have 100 girls, it really wants to appeal to as many waifu tropes as possible. Which leads me to the, uh, lolis. So far, there's been 3 lolis, 5 if you count Kurumi and Momi. There are also 3 (technically 4) adults in the situation, one of whom is the director of the school (not to mention the mother of one of the girls), which is a, uh, skeevy sounding situation to those who aren't used to the usual anime tropes. But if you can look past those (or are already desensitized to the usual anime/manga skeeviness) I truly think you should give 100kanojo a try.
School Zone (Ningiyau)
While Yuri/GL is not necessarily my forte, I did enjoy School Zone Girls. It features a lot of romance options, all of which are good in their own way, and if you do love cute girls doing cute things who look generally shippable together, I believe School Zone Girls would be a good manga for you.
Kakegurui Futago
While I've read a few chapters of Kakegurui - Compulsive Gambler, I can say with certainty that Twin has given me a much more enjoyable reading experience. Twin follows Mary (or Meari, if you prefer) when she first starts attending Hyakkaou. Like Yumeko, she makes a strong entrance by beating the class bully. Unlike Yumeko, however, Mary feels like she's actually trying to strategize and win. In general, Mary was much more likable as a main character, and following her journey through Hyakkaou was beyond riveting. If you wanted Kakegurui but less horny, I believe Twin has got you covered. Also, Hoshizuka is for sure gay for Mary.
Lazy Dungeon Master
I like the concept, but... it's really horny. Really horny. The MC is (thankfully) more of a feet guy, which I did laugh at, but you can feel the author's intent.
Kanojo mo Kanojo