I went with "Both are great!"
To tell you the truth, there isn't much about the Pridelanders (other than the distinguished ones like Simba and Nala) to like as they are background characters, and each individual personality isn't explored because they aren't important characters. However, I like their neat designs, even though they are usually the same; although at times, they even look like outright clones of the prominent lionesses like Nala and Sarabi.
The lioness on the left looks like a Nala/Sarafina clone, but with red eyes.
While here, this screenshot shows some Sarabi clones, especially the lioness on the right.
As for the Outsiders, well, their designs such as their crooked, black nose and extended claws basically originate from Scar. But, each Outsider lioness has their individual unique designs like the fan names given to them such as "Spotty" and "Dotty". However, similar to their counterparts, their designs often changed to resemble Zira and Vitani. An example of this is
"Digger", who is a direct look-alike of adult Vitani. Much like the Pridelanders, each individual personality isn't explored, but they have a change of heart and think for themselves which leads to them bettering their lot towards the end of
Simba’s Pride, which I liked.
To sum up, I like both prides the same because other than different designs, they are the same when it comes to their importance in the story.