Comparison of Wireless Broadband to DSL

I’m inclined to change our present wireless broadband internet connection (8 to 88 kbps)to a ADSL service (128/256 kbps)@ 16 kbps committed informattion rate (CIR), price lower than the wireless type, is this advantageous to our company? We currently have aprox. 50 computers on our LAN but not all are to be connected to the internet.