Hello,
The SKB r-100 does not have internal cushioning, as it is directly rack-mounted. With rack ears adding 3 lb, this case at 16.4 lb, SQ5 at 23 lb, the total weight is 42.5 lb.
The Gator GTSA-MIX192108 is a lower weight, lower cost, better cushioned solution. But it’s not a perfect snug fit like the GTOURAHSQ5NDH.
So it really depends how rough the mixer will be transported. The GTSA-MIX192108 will definitely last the longest and protect the mixer the best with high-density cushioning material, with a carry weight of 48 lb including the mixer. I would have no problem flying with it as checked bag. Yes, you will need to remove the rack ears. I wonder what the purpose is to leave the rack ear on for transport?