Wrestled with this one ever since the ZLE came out.
I had an M6 5th Gen Z and loved it.
For a regular ZL1 there is no question, hands down, A10 all the way.
You're still going to deal with the bog issues but not near as bad. My best 60' was 3.6 and I had a bunch of 3.7's but you know the minute of launch whether it will be a good or bad time.
The A10 is programmed so well for the road track there is no question there either, but this car lacks on the drag strip due to bog no matter which trans you get.
For me once you throw in the 1LE package it's pretty much a toss up between the two. I've ordered the ZLE now so going back to M6 and don't plan on drag racing it since we all see it's not made for that. Definitely going to miss having the A10 and hope to see GM couple the LT5 with the A10 someday.
Here's a thread that may shed a little insight to the bog issue.
https://www.camaro6.com/forums/showthread.php?t=520373