For me, advantages were they weren’t shite- I put dirt cheap tektros on with standard pads and they worked better than any cantis I’ve ever tried. Not to mention less fannying about trying to get the bastards to work. Cantis are shit, everyone knows it, the only place they have any more is in cyclocross where the entire point is that the bikes are shit.
Downsides- a bit less mud clearance. Not an issue for normal person riding ime but could be an issue if you’re a glutton for punishment and/or racer where you might well be riding through the most joyless miserable shite imaginable at which point it’s an issue, although it can’t possibly spoil your day because it’s already as bad as days get.
Removing wheels was slower as I had to slacken it off using the barrel adjuster. Oh and when I fitted mudguards to the bike, the straddle wire fouled the guards and I ended up having to cut a notch.
Oh and they do wear your rims faster, because they actually generate friction unlike most cantis. if that bothers you, you can oil them