Quote Originally Posted by printbus View Post
The difference is in the package. If you opened up a DC SSR you'd probably find it uses a MOSFET for the switch. The "better" one would depend on which one has the least on-resistance, since that would lead to the least voltage drop or power loss in the MOSFET/SSR.
Or... stated a little bit differently... The lower the 'Power loss', the less energy that is turning into heat and cooking the MOSFET.