I have tried both plus an “Herbal” one called “Hot Rod 5000”. All work great, with generic Viagra (Sildenafil) being my preference. Since I don’t have ED, but use them for that extra boost when I have to wear condoms - I am not sure if results are different for me. The side effects are a bummer, but I am used to them. (Flushed face, runny nose, heartburn, and sometimes headache.) I still find it worth the consequences when I am meeting someone new, or where nerves or condom use might affect my rigidity. Sildenafil is still expensive, but a coupon on line from Good RX brought cost down to the crazy great price of 24 cents per 20 mg pill. That is HUGE! Have fun:)