The cordless won't have the staying power the corded does. Cordless is only a handy thing to have. I just had an experience with a vanity sink. Had to 'move' the holes for special faucets. The sink material is quite thick where the faucets set. I went through 4 carbide and four diamond Dremel bits, and well over 4 hours grinding time. I used my corded, as the battery one we have (wife's) would not have held up. But, they are handy.......
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