I both like Solo Leveling and Frieren. The Solo Leveling is an OP story and provide good entertainment for individuals. I think the fast-paced and catchy flow of story attracted most viewers. The "weak to strong" storyline is quite compelling but isn't unique story but it provides very nice flow of story, backgrounds and though it tends to be fast-paced, still gives you enough information of why and how. This is enough to make you like it. On the other hand, Frieren is quite the opposite of Solo Leveling. It is slow and requires quite good amount of attention for you to truly appreciate it's beauty. I totally agree to some that Frieren is beautifully crafted masterpiece. The storyline is unique and warmth, the flow might not be as catchy at first like Solo Leveling but it is very lovely and as you progress, the emotions in the story is sweet and slowly captivating your attention. As I said, I like both anime. As anime enthusiast, I think Frieren have a little edge than the Solo Leveling. The story is rather more unique, the quality of the the anime is crisp, the character building is better, and the delivery is a little bit smoother.