Of the western dolls:
Mechadolls are supposed to be the second most durable of the silicone dolls.
Cyborgasmatrix is the most durable, but lacks variety and hands and feet.
RealDoll is hard to maintain without tears or flattening. Even if stored in its crate the buckles and straps can leave indentations and if you don't get the leg spacing right it will also tear. The repair kits are supposed to be very good if you know how to match colors.
Silicone Doll Works is crap because they have sharp seams, bad neck joints and the silicone is only a skin over a foam body.
Candy18 is similar to SDW, but they have a better reputation although still "mottled" in appearance and prone to rips in the skin.