Hey Mrevets, welcome aboard! Am I correct in deciphering you’re a vet that enjoyed the fine cuisine packaged in a thick brown bag, compliments of Uncle Sam? 🙂
Regarding your question, most people prefer the OEM cargo mat because it has a built in crease or groove that allows for easier opening of the under floor storage lid. Regarding splash guards, the OEM ones look very nice, blending in well for a nice factory look. Some like the WT’s for the greater coverage area. The key deciding factor is going to be the type of roads you ride on. For dirt/rocky roads, you’ll get better protection from the WT’s.
Click the link in my signature for photos of the OEM splash guards and other accessories.