They fulfill different roles in the PLARF.
DF-41s are mobile. They can be carried around by TEL trucks and trains so it will be hard for other states to target and destroy them in a first strike. However, the missile will have to be light enough to be transported by a truck and small enough to fit through tunnels or under bridges. Thus, DF-41 (and other road mobile missiles) are limited in size and weight. A smaller missile also has a smaller payload, which means less warheads can be carried per missile.
On the other hand, DF-5s and other silo-based missiles are not designed to be moved easily. They are larger and heavier than road-mobile missiles. So it is a lot easier for DF-5s to carry more warheads and decoys to penetrate enemy defenses. However, the extra power came with the cost of survivability. Fixed launch sites are easily located via satellite imagery and they are probably the first targets to be attacked in a large-scale nuclear exchange.
In very rough terms, you can say that DF-41s are more survivable but DF-5s are more devastating if they can be launched.