Have personally owned PSM900 while the church has Sennheiser G3 IEM. For full range sound I would go for G3, though it has higher noise floor it sounded nice especially for full band instrument. I am not sure why but PSM900 sound seems a bit mid-centric and bass sound weird, but I do not notice any noise floor on the Shure system, I do think Shure sound nicer on Vocals.
I do see digital is the way forward, you could put more content at less the bandwidth requirement and thus better stereo separation and bigger range of frequency response.
