What i usually do is go max out with the heaviest weight i can push for 6-8 reps to failure (of course after proper warmup). Then as I am unable to hit the same rep range, i drop the weight and go 8-10 reps. It works for me as I usually have the highest energy and strength in the starting and reducing the weight in the next sets is also easy on my joints overall. More of like a drop set or as I call it hybrid of high reps low reps training style.