I tried each version - sildenafil, vardenafil and taladafil:

Sildenafil is the one I used the most, it's the most effective but also has the most intense side effects (lightheadedness, stuffy nose). But it does make me the hardest out of all of them.

Vardenafil was the next I tried, it tastes the best- minty flavor. But was also the least effective of the three for me- no noticeable benefits and had minor side effects, similar to sildenafil.

Also just tried taladafil- it worked slightly, not quite as effective as sildenafil but I could feel it in my system for at least a couple days, luckily with almost no side effects. If anything, it made it easy to get it up but not nearly as hard as sildenafil.

While I don't need any of these, I trid them out recreationally. Vardenafil was a major disappointment other than the taste. Sildenafil is effective but the side effects can be a little intense to make it worth it long-term. Taladafil was fine but could be more potent, I may try doubling the dose to see if I get better results soon.