You say you intend to use these in your home portrait studio, Sam. Are you planning on getting only 1 unit? What about stands, modifiers, triggers, backdrops, etc. One strobe does not a portrait studio make. Will you ever need to use them outside as well? That too has its pitfalls. Both units have more than enough power plus a decent GN and recycle times.
I'm not sure you need 400W though. If you were going to use them outside, and try to face off against the sun, then 400W plus is ideal. Inside, depending upon the size of your space and the modifiers you plan on using, 200W could be plenty. I'm not trying to be difficult. Just trying to figure out how best to advise you.
There are some awesome portrait photographers on here, but they will all need just a little more info to help you in a meaningful way.
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Further, I should also say that I am a GREAT fan of site sponsor
Fotogenic. They have kits that include all of the necessary bits and pieces at reasonable prices and I find their Menik strobes to be robust and reliable (I'm on my second set ... sold the first set to go outdoors compatible). Hope that helps.