I've yet to find a combat system for Traveller that I'm comfortable with. And that's after 30 years.
I think there are immense differences between playing FtF/realtime and playing via online forums.
Back in the days of FtF at college, we found the AHL rules to be good, if lengthy, and over the years I've tried to improve them with house rules, but they proved to be far too cumbersome for forum games.
The LBB1 rules are over-simplistic for my tastes OTOH.
I'm not convinced the MgT combat system works - I found it next to impossible to hit anything, and I took one look at the complexity of MT and gave up.
I've tried several outside systems, but I'm still looking...
Like Skytrain2 and Tobias, I sort of go with LBB1 but more freeform - basically make it up as I go along.
One day, I'll probably develop a system from scratch.
I just need one of those round tuit thingys.