I have been using a Z4000 and a MRC Dual Power on my home layout for 10 years. I haven't had any issues with TMCC, Legacy or DCS with either of them. I prefer the digital readout on the Z4000 over the analog meters on the MRC. The MRC was certainly the most economical 10 years ago which is the primary reason that I bought it.
My club uses two Z4000s. Again there are no problems with TMCC, Legacy and DCS. They were expensive.
I thought that MRC no longer makes the Dual Power and that MTH is stopping production of the Z4000. Both are excellent units and it is a shame that they may no longer be available except on the used market. NH Joe