[Redtwin]

I'm a fan of 100% sand if you are trying to level. Like the comments above, any organic matter will breakdown and reduce the effectiveness of all the hard work involved with leveling. With regular fertilization and root cycling, I don't see much benefit in adding organic matter to my sand level.

Full disclosure: My entire soil profile is almost completely sand so it's an easy decision for me.

 

[Redtwin]

Does it matter if the lawn is only a few years old? If its more immature should a compost mix be preferred over a sand mix?

Thanks

I suppose it depends on the variety but I sand leveled my Empire Zoysia twice last summer with no issues. It was put down dormant in January. If it's rooted and growing you can put down sand. If you are just doing a light top dress then maybe adding some organic matter would be OK; not needed, but OK. If your goal is to level then you need to go 100% sand.