So in 7th edition Daemonsmiths were a level 1 wizard with a boundspell and an okay fighter. Under the 8th edition errata however daemonsmiths lose their wizard level and bound spell and instead get an improved Daemon Weapon Bound Daemon table. Now compared to the slavemaster they get more points to invest in items and the possibility of having more attacks, but on average it looks like a slavemaster is just a strictly better buy.
Slavemasters are cheaper, already have most of the stats the bound weapon can buy, can buy a magic weapon if you want and no possibility they are going suck in a game (unlike the 1/6 chance the daemonsmith might roll a 1 on their weapon). So am I missing something that makes the new daemonsmith any good?