We used both routes while staying in the Champions Gate area a couple weeks ago. There was much more traffic on Old Lake Wilson Road (is that 545?) due to the construction of lots of new condo developments. We finally decided tha I4 even with the construction was faster for the times we traveled. Luckily we were never delayed much on either route.
I am thinking next time we stay in a villa we need to be a bit closer to 192 if the level of traffic on Old Lake Wilson gets any heavier. Once you get to Sherberth, it is a breeze. I also like avoiding 192 except for that one block getting to Sherberth.