Tough call tbh, especially since you can include the refill and leaked songs from relapse, when recovery has session one and ridaz.
I recently listened to relapse straight thro and realized (even tho i always liked the album) how sick it really was lyrically, it has great entertainment value, and does seem like a concept album that works.
Recovery is sort of all over the place, but had so many dope songs and moments that it worked, and worked well. I honestly can't pick one as being better because they are so different, but I think based on total number of songs I might lean towards relapse if you include refill, since a lot of refill songs I fuckin love.