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The reason I would prefer the navmesh in this situation:

• Don't have to tweak two different sets of navigation set ups.
• The navmesh is easier to visually debug than collision. It can be harder to setup since it bakes based on renderer meshes though.
• Navmesh does not allow for the player falling off into the void. This sounds like a joke but it was a serious problem on the development of some big games.
• Having the player pathfind is possible (can be useful for cutscenes or some interactions if you want to have much larger interaction regions than interaction alignment).
• Kinematic rigidbodies are difficult to tweak to a good spot for a player character. They are suited for physics type games but for a player character they tend to bounce around and clip through things too much.

There are some drawbacks too though. I haven't done 3D in a qhile but off the top of my head:

• Doors are tricky to do well. Its worse on AI though than for a player character. You can probably handle with either navmesh links or navmesh obstacles. I guess even for rigidbody or CC doors are a pain though.
• You need to add a kinematic rigidbody if you want to get trigger or collision callbacks.
• Other agents may try to walk around the player which could be a problem for zombies chasing the player. Once way around this is to have them approach a point that is between them and the player instead of the player center position.
• Different sizes of agent sizes are not supported so unless you want to do fancy workarounds your player needs to be the same navigation width as your enemies. This is probably not a problem as they are both humanoids. If you add dogs you will probably need to solve this anyway between zombies and dogs. You can do this using an iterative navmesh bake process where you dynamically create a mesh based on the first bake and then change navmesh layers to do the second. Thin enemies can walk on both layers but fat enemies only on one.

Probably for the time being its not important to change but when you get to a point you want to work on player character control I would recommend considering it. At some point when you get around to animations of zombies grabbing players send me a message or something since I have went to hell and back to make pair animations look good.