My intonation stickler friend maintains that there is no way that any side gripping capo can match the one he has that tightens evenly across the fingerboard from the back of the neck. He says that the Shubb and others can't help but tighten down on the strings unevenly.
I can't recall the actual one he uses, but it kind of looks like this ....https://www.sweetwater.com/store/detail/PO-6--paige-6-string-standard-capo-black?mrkgadid=3331288745&mrkgcl=28&mrkgen=gpla&mrkgbflag=0&mrkgcat=guitars&acctid=21700000001645388&dskeywordid=92700046938600946&lid=92700046938600946&ds_s_kwgid=58700005283398302&ds_s_inventory_feed_id=97700000007215323&dsproductgroupid=522112415470&product_id=PO-6&prodctry=US&prodlang=en&channel=online&storeid=&device=c&network=g&matchtype=&adpos=largenumber&locationid=9003398&creative=332063179836&targetid=aud-373947915057%3Apla-522112415470&campaignid=1708733954&awsearchcpc=1&gclid=Cj0KCQjw1dGJBhD4ARIsANb6Odk8YlQmUBE_xeHJqfQlyyuveu9G5sJ4fnTuw1sXm4qp2ii6GEhwfBEaAi-EEALw_wcB&gclsrc=aw.ds