Hi Will... there are a few ways to achieve getting an obj sequence into XPression.
With Ripetide Pro you can export an obj sequence as you mentioned but unfortunately it will not bring in the textures, you will have to add these again once in Xpression. If you bake your object, you will create a texture and also obtain the UV coordinates and then you can just add this to your mesh node. If you have created selection sets then these will also be visible, even if you don't bake the object (it may not be required), you can still add your base materials.
If you would like a bit more flexibility then isolate the elements by grouping them and hide them in Cinema 4D, then export the scene out separately, this way you will have different mesh nodes to add textures/materials to. This can be a bit time consuming, but better for refinements, especially if you are constantly exporting/testing and tweaking animations,
Lastly, if you have rigged/skeletal type animations that you have created in Cinema 4d or perhaps you have imported them into Cinema 4d as an FBX file for example, then if you try and export this out as an OBJ Sequence, once you import this into XPression the animation may not have worked (its not XPression its the OBJ Export). To solve this I use another plugin called Steady Bake from TCA Studios which will calculate the animation/s and bake them on the Timeline in Cinema 4D frame by frame. This is very accurate and will then set you up to export through Riptide Pro.
Links below, would recommend upgrading to Riptide Pro as it will save you a bunch of time and has more settings. Steady Bake is Free!
There maybe other ways and plugins available but have been generally happy with this process to date.
https://skinprops.com/riptidepro.php (Rip TIde)
http://tcastudios.com/?p=19 (Steady Bake)
Good luck....Joph
#XPression