Been off my ATGs for a while (been grinding Ventures and Indy). I find I prefer the feel of Indy/Venture when grinding over the 'hollow' feeling of the ATGs; it's just more solid/visceral on aluminum vs. magnesium.
As for grinding ease, I'd say on worn in curbs or angle iron/bars/metal whatever, there doesn't seem to be an advantage with the mags being able to grind better or farther (however, you can go a little bit farther with less speed on the Mags) that only applies on shit surfaces, much how the TiHs would grind better on stone/concrete).
Also, coming off the Ventures I felt too high and tippy / very unstable the ATGs (using bones softs in them); guess I got used to those Ventures

Switching over to Thunders for a bit as I think they are still the happy medium between the two.