On an older Mac (G5/1.6GHz) or PC with original PCI, there are RME ADAT cards like Project Hammerfall
and the later HDSP cards with ADAT 24 i/o @ 48KHz/24bit or 12 channels at 96Khz. These are trouble-free and excellent.
Metric Halo ULN-2 and 2882 in the latest versions have huge onboard DSP (2d) for mixing and effects as well as Firewire computer connectivity (DAW i/o) and one ADAT port. Super-quick and good support. Mac only.
ADAT was designed as an audio interface at the bleeding edge of what could be done for cheap 15 years ago, so now it's a legacy interface. Firewire is a wide-band high-speed modern interface that can move multi-track audio even in the slowest version (400). Latency is low, if you have done your part.
MADI has never been cheap. It seems a bit overkill for consumer applications, so it may never be cheap like Firewire or ADAT.
I don't see the 2 formats in conflict. Use them for what they do best.