is it ok to stud drive soffits to concrete? im framing around a large pvc pipe in my basement and the only way to do it that works for me is to connect the soffit frame to the concrete foundation wall. im concerned about this not being sturdy enough. the soffit will actually be the top 3.5 feet of the wall. is this a bad idea?

I was wondering which is cheaper. A sheetrocked ceiling, or a tiled ceiling. The rocking would be done by me, but the muddin and sanding would be done by a local contractor. I would install the tiled ceiling. By tiled ceiling, i mean a drop ceiling, but it isnt dropped, it is right up on the studs. I'm not worried about ceiling height, but the higher the better. the rest of a section of basement that i am finishing will be rocked by me also, but i'll have to hire out help for the tape/mudder and sander guy. Not sure if that will have a break in the price or not. The room is 30'x11'. There is duct work that will need to be rocked also. Thanks for any insight you can provide.