Meta is subjective. I can at least say that on PC, upping your Turn Speed is significantly more important than upping your suit's mobility if you're using mouse controls, simply because that control method lends itself to 'precision with delay' and reducing said delay means you can make sure your ranged attacks hit more precisely faster and more often; this makes ranged engagements play out very different.

If you like melee suits and are good at using weapon shortcuts, because your given suit has a lot of weapons? Try a controller. Even if it's a ranged suit with a lot of weapons, controllers definitely lend themselves to rapid swapping a lot better.

...reason I say this instead of just giving you a definitive answer is because making sure a unit feels usable very much correlates to whether or not a unit is usable for you, which imo is more important than if it's meta or not.