Yes, I’ve used both more than once. If you’re predominantly using it for transporting a road bike, my preference would be Alan bike box, as they’re super tough and crush resistant, so no worries if your bike has a carbon frame. They’re also relatively easy to tow along through airports etc. (The Evocs can occasionally get a bit more wibbly wobbly if they’re really loaded up with heavy mtb and kit – and the last thing you need is your helmet popping out in the airport terminal!:))
The main downside I’ve found with the Alan boxes is that the ones I’ve used didnt accommodate my MTB very well, but in fairness it is a large size full sus 29er. With that bike, it was tyres of rims, fork and derailleur off bike. I think a smaller 650b MTB would be prob be much easier.
The Evocs are much more MTB friendly. The main downside I’ve found is their susceptibility to crushing. I once travelled with my ‘garage queen’ SC carbon full sus in an Evoc, and everything was going well until I saw the baggage trolley going out to the plane – my bike bag at the bottom of an enormous pile of about 60 bags! The plastic reinforcing rods in the bag broke under the weight, but luckily the bike survived with just a minor scratch (luckily I’d taken the brake rotors off the wheels) This put me off using Evocs for carbon framed bikes.
Hope this helps.