Fibre is much faster & stable compared to Wimax. The Speed results you are getting are most probably not accurate ,if Zol gave you the speed test site. Find a different site to measure your speed. Speed on the fibre depends on what & when you are downloading. Torrents are shaped, so the speed is controlled normally from 8-00 to 17-00.
Don't be fooled by the sales gimmick "up to 10mbps".... Its is UP TO....which means from 0 -10mbps......there is no guaranteed speed....
But in short I had Wimax & now Fibre. Comparison: Wimax is like Mickey Mouse compared to Fibre.