HI guys,

I've done a quick search but haven't got a clue what to look for so here is goes.

Last week I did DB bench and managed to lift 42kg on each dumbbell 6 times so this week i decided to try and do 43kg on each. However, I only managed to do 5 reps. I was trying to hit 6 reps but I only managed to do 5 so I felt like I didn't do as well as the week before.

In your opinion, is the 43kg x 5 better than 42kg x 6?
Are there any calculations that I can do to work out which one was actually better?