Just out of curiosity.....
Given the lifespan of rifle brass, is the amount of material removed by cutting really detrimental to (what is usually) one of the thickest part of the brass ?
If you no longer desire your RCBS de-crimper, feel free to mail it to me....I can have my wife "help" then too
Personally I use neither method you mentioned frequently.
I simply found it faster to use a tapered T30 Screwdriver and just twist 'em out by force.
Granted, I possess extreme hand strength, but know of folks who use a similar technique using a slotted screwdriver with similar results.
I guess technically this might be referred to as "cutting" so throw me in that camp I suppose.
This way I can de-crimp whilst watching shows with the wife with little mechanical noise to bother her (gets two mind-numbing activities out of the way at once).
Using the RCBS trim-mate and pocket uniformer on each piece afterwards tells me instantly if I did my job correctly or poorly, but most often if I just need to re-taper the edge of the torx. ( not often...machine and tool steel far out-strength brass )