I use the digi ones every month - as I would drive myslef mad looking for lines that werent there so prefer a smiley face!
I have a 28-30 day cycle - so usually start using the digis at CD12 - usually use about three a month - as as soon as you get a smiley face then you dont need to test again. They are expensive but as they have seven sticks in a pack they usually last me at least two months.
I am always regular and get the other signs as well such as EWCM and ovulation pains - but I always like to know the exact date as then I can predict when AF is coming so that I dont get myself in a tizz if I have a 30 days cycle rather than a 28 - as those extra two days are like torture if I am not expecting them.
I really like the digis and have always found them reliable.
I do use first thing in the morning wee though - which other girls on here have recomemended not to - but I pee ALL the time (if I ever do manage to get a bfp I honestly am going to be on the loo permanently) - so thats the best time for me as I just couldnt hold it for 4 hours. But i have never had any probs using early morning wee as the sticks are always right (cos they coincide with my other signs and 14 days later AF shows up).
Hope this helps.

Hope they get you your BFP this month.
Bx x x