as a 3PAR customer for 11 years and Nimble (though the Nimble in my org is run by another group), am curious what is old about 3PAR vs Nimble? Nimble's original claim to fame was true hybrid SSD+HDD. They have since introduced all flash systems, but am not sure what may make 3PAR old vs Nimble not old in an all flash world. I don't know how well the older hybrid SSD+HDD systems are selling but the architecture seemed certainly nice (much nicer than tiering, I have never used auto tiering in 3PAR or any other system).
I guess Infosight is good (have not heard of it or seen it, I wrote my own 3PAR monitoring tools have not even tried HP's latest stuff whatever it's called these days, HP folks have repeatedly told me over the years I manage my 3PAR systems better than any customer they had ever seen).
I would ask the people that manage the nimble at my company but have absolutely no doubt they have no idea, as the person(s) that procured the systems(1 or 2) have long since left the company and the rest of the folks on the team I don't believe are up to speed on the platform.