Good question. I’ve tried umpteen sorts of cantis and honestly, they really aren’t much of a muchness at all. I’ve just upgraded some Crux Elite brakes for a friend as she hated the rubbish ones it came with. I fitted some Froggleg-style brakes, TRP Eurox, and they were a great improvement; good for CX racing but still not particularly strong and need a bit of fiddling to get them to work the way you want. More power comes from things like Avid Shorty 4 or 6, (cheap but also quite fiddly to set up) and Avid Shorty Ultimate (good but very expensive), Shimano ones are good. I’ve just started using CX-70s and I like them. They have as much stopping power as dual-pivot road calipers and were particularly easy to set up. If you want even more power, go to mini-Vs or TRP CX9.0. These are powerful but have less mud clearance than cantis, there’s very little pad travel so they don’t cope well with wobbly wheels or swapping between wheels with different rim widths and they need adjustment as the pads wear.