I'm looking at a couple deff dreads to add to my list (actually I'm already converting/building them, cos they're cool models, but I would also like to add them to a few of my future lists

) but I'm just looking into the pros and cons of loadouts, and what is best to use.
I'm magnetising the options anyway, so most of it is not going to be permanent, but there is an element of forward-planning needed.
In the past the thinking seems to be that 3 close combat weapons + 1 skorcha is the default good build. Lots of attacks, skorcha can soften up mobs before charging, and if immobilised or in overwatch stilll lets the dread throw out some fire.
However I'm now wondering if there is any advantage to:
2
CCW + 2 Skorcha
or
3CCW + 1 rokkit (or even the mega blasta... though the get hot roll isnt great)
Any advantages under the new 7th edition rules?
Thanks guys