I find guitar amps too trebly, regardless of any explosive-type issues... I've always used a bass amp - much deeper and richer sound. I had a Dynachord 'Imperator' for many, many years... amazingly good & resilient amp!
D.I. is, of course, easier, and I guess it's OK for the portable Roland I usually use, but not really relevant for my Hammond & Leslie combo... and anyway, I like to use fuzz & other effect pedals on the piano so that needs an amp!
Sorry but I'm old-school and probably not the person to be answering your query... I doubt there are too many others lugging around similar monstrously heavy behemoths or putting electric pianos through guitar effects these days!
So basically, do whatever suits you best for the sound you want plus, as Kendall said, taking into account the size of the venue...
Cheers