viagra you'd be lucky to finish at all. It's so hard it's almost numb. and lasts a while. The first time i tried viagra i got a headache. (the one on my shoulders) and felt awful. After that you get used to it, or use a lower dose.
With cialis you mostly only get it up when you get worked up, like you did when you were 18. It's hard as a rock and sometimes bigger then you normally would be. You don't last any longer. It just feels more natural. In the bigger dosages (20 mg) you may feel flushed or feel your heart rate in your forehead. But on the 5 and 10 mg you feel a lot better.
5 mg you can take on a daily basis so it's there whenever you need it