I’ve had both 11s and 33s in my trials riding days. The slave pistons and the bits at the wheel end are identical on both apart from colours.
The lever is the main difference. The 33 has a shorter lever for 2 finger braking, has on-the-fly pad adjustment, and has an all metal construction.
The 11s have a plastic/resin lever construction apart from the lever blade itself, and pad adjustment is via allen key. They flex a bit more in use, and dont look quite as good, but preformance/power is very similar to the 33s.
As for the comparison with Vs. Well both the 33s and 11s will be heavier than a good V setup. When both are set up properly the power is similar. The main advantage for me was reliability. They were put on the bike, abused for around 5 years in all weathers, then sold still working the same as when they were new. I find Vs need regular attention to keep them working properly.
The other advantage was they looked cool. Especially as I had SID blue ones when everyone else had yellow 😀