am i backing myself in a corner.center diff vs slipper clutch

[alcyon]

I see more and more new 1/10 4wd buggies using a center diff and most people swear by them.
as you all know i put a lot of effort to modernise both my optima mid and my lazer zx with a vts slipper.
in the last buggy race i joined in on the 8th i placed pretty well with my fixed driveline full time 4wd lwb optima mid with vts slipper on a low grip bumpy track. I an pretty sure most of my competition were using center diffs. Its impossible to have a oil filled center diff on both of these old kyoshos. What i want to know is what kind of disadvantage am i placing myself in by using my old buggies with a slipper on tracks over here.
Is it really a lot of difference or would the vts slipper be able to compete against these modern cars with center diffs.
I was just wondering if the competition will figure out the best setting for their center diffs and leave me eating a lot of dust in the next race on the 12th of april.