OT but the major problem of meters in SC6 is not in the meters themselves but in Reversal Edges, they give way too much meter. Surprised they still haven't patched the game to reduce it after all this time, was pretty clear already after the first month.
I still don't like meters but if I were to pick who does it better between SC6 and DoA6 I would have no doubts in choosing the latter, personally. This is because:
1) DoA6 has no mechanics that give too much meter (Reversal Edge),
2) DoA6 doesn't give free meter on the last round of a fight
3) DoA6 meter offers meaningful strategic choices with the Break Holds, I really like that. Whereas in SC6 you "just" have a powerful move, often used as a comeback, or "powerups" to give your char some seconds of empowerment. Less strategy, more about pure attack.
4) SC6 has a huge variation in terms of Soul Charge / Critical Edge power/efficiency. This is appearently good for the sake of variation but it's so unbalanced and frustrating, whereas in DoA6 it's pretty much standard and feels like a basic element of the game, not a special thing of each char to give them additional flavour