The CB one measures both the oestrogen surge (flashing smiley) and then the LH surge (solid smiley), so the flashing smiley is showing that your oestrogen is rising. The cheapies just measure LH, so they won't look positive until you get closer to the solid smiley.
With the lines on the CB sticks, you can't use them like the cheapies- they mean different things. When I would get my peak, my lines would be the same colour though. It varied a bit but overall, the more they got to be the same colour, the closer I seemed to be to ovulating.
We would start BDing EOD once I got the flashing smilies, and attempt every day once it was solid (though sometimes still just managed EOD then too).
I sometimes had 10 days of flashing smileys before getting my solid, but I have PCOS so not a good example! If you have a normal cycle, it should be coming in a few days! Happy BDing!