I bought my May L2 DAC before the LTA Aero was developed, but it probably would have been on my short list too, so I understand your conundrum. You’d probably be happy with either, but I can tell you that I stopped thinking about DAC upgrades after I put the May in my system. The LTA does allow for tube swaps if you’re into tweaking.
My May’s USB input takes a few seconds to lock onto the signal when it’s first turned on, but once it does, there are no hiccups or pauses.