There are no static aircraft in the LAS scenery. The only static aircraft I've seen in FSDT scenery are about 10 C-17's included in the PHNL scenery to make the military ramps look populated. Otherwise, nothing in any of their sceneries.
Personally, I'd uninstall the Simwings version of LAS if you have the FSDT. However, it's up to you and depends if you're thinking you may want to revert back to it ever (not sure why you would though...the FSDT looks much nicer and if anything probably performs better).