Smaller format doesn't necessarily always mean more competitiveness. However, its worth mentioning 10vs10 format (edit: for groupfighting) favors lines-up functioning on a small core and not necessarily capable to rely on many sub players and give them more chance to upset the top regiments.
The larger the format, the better regiments like 15thYR, K-KA, 91st will be because they have a larger competitive player base and therefore are arguably capable to field more skilled players if the numbers increase.
Nothing really new under the sun.
Edit: Either way, when it comes down to 1vs1 LB, I would love to see another EIC/NWL format once the Napoleons Cup is other. I've missed casting/watching this and it goes without saying Syrcrim and I would be thrilled to cover such a competition on a regular basis.