unless you're using an overwhelming amount of algs, more algs tend to be better if you're using good algs. it just takes time to train recognition and execution. collin burns with oll, pll, and winter variation will be faster than collin burns with just oll and pll in the long run. i don't know cfop that well, but i think this is apparent because instead of doing f2l pair, oll, pll you do winter variation, pll. i would assume winter variation has similar recognition as f2l+oll but faster exectuion.
in terms of roux vs cfop, can't really say one is better than the other based on the number of algs. they are too different from each other. but even in roux, knowing more extra algs is useful. for example, knowing multiple cmll for each case can often be used to avoid bad cases or set up good cases in lse.