If you are not the best at taking care of your stuff you should probably stick with the Cavier unless you are only going to use the Lambskin flap once and a while.
i would suggest lambskin for 2 reasons:
1) variety , since u already hv a cavier jumbo
2) Lambskin in m/l size is easy to care for especially black. I hv a red M/l lamb and it's my fav bag!
HTH