Definitely both, because I'm a dumdum. I'd want the Pro because I simply need the latest and greatest from Nintendo. And I'd like the Mini - assuming it is actually more compact than the current model - as my always-with-me Switch. Now, there are definitely caveats to both versions that may prevent me from getting either, but I guess we'll find out at E3.
With infinite money and free time, I'd definitely buy the Pro. But with the amount of money I normally like to spend and the amount of time I spend on video games right now? I have to go with Neither.
I'm not interested in a handheld-only Switch, but I think releasing some kind of model for $200 would be a good idea around Pokémon launch. $300 may still be a bit steep for some families to want to spend on their kid(s). Especially kids who can't share.
I've also never been interested in hardware half-steps and think the concept is pretty lame. But I feel like it would probably be a good idea to get a new system at some point; nothing lasts forever so I'm sure the Switch will need replacing at some point. I wonder if there will be a third remodel by then though...