I'm only Diamond but reaper into 3 rax with a fast +1 (Learnt it from Kang at a lan) is my goto TvT. You have to be very aware of what your opponent is doing though. But If you know for certain that they are doing a 1 base tank all in moving to the centre of the map once you have combat shields is a pretty easy way of dealing with it (assuming you can keep your marines in a concave as you engage). If they make it to my natural because I am oblivious or something, I wait for plus 1 if it is not too far away and run at them with all my marines and scvs. You lose a lot but 2 orbitals means you can usually afford it.
It all comes down to map awareness. Holding this kind of 1 base play in TvT for me is usually just a question of whether or not I was holding the towers that game.
I do reaper expo with fast upgrades for "standard macro" build, but it's pretty hard to fend off stuff like banshee 1/1/1 and 7-8 min tank build, especially on certain tank maps. Also, it's obviously weak vs 5 reaper w/ or w/e helion medivac. Depends on map and spawn pos, but i wouldn't say reaper expo counters marine tank stuff like remaerc is saying.
Even the smallest donations help keep sc2sea running! All donations go towards helping our site run including our monthly server hosting fees and sc2sea sponsored community tournaments we host. Find out more here.