My opinion: if you have to deal with animations, emitters, animesh, skinmesh, doors, creatures, lighting, and if you have to re-import your stuff (also tiles) nwmax aura bases are better BUT, if you build static placeables or tiles (so most of the tiles), mdl-suite is waaay more quick, light on the script side, handles woks in a user-friendly way (maybe thats the best point of using it instead of nwmax wok chaotic interface, that im not able to edit at all). mdl suite has couple of disturbing bugs on model import (that can be done by drag and dropping the file inside max), namely it destroys smoothing groups, and it doesnt import all the trimesh modifiers, and when it does, changes a few of its settings (which are way more generic that nwmax aura base ones).
I am using mdl-suite for most of the tiles i make, and if i have to add animesh/animations to a tile, i export it with mdlsuite and reimport with nwmax, to complete the work once all the geometry, texture mapping and walkmesh has been done with mdlsuite
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but i agree for doors and creatures it is best to leave mdlsuite in the closet, nwmax handles animations way better