i use a upper/lower ...kind of... so if i hit the gym 6 days this week upper bod will get hit 3 times.. with the increase in frequency i have to watch intensity increasing techniques like drop sets , forced reps, partials ...etc... i don't do any of those...
i have 3 different upper and lower style days that i use so all upper and lowers won't always be the same... one upper day will be bench focused supersetted with face pulls then seated overhead supersetted with curls.. . the next upper day will be more pull focused... chins supersetted with close grip bench... rows supersetted with incline....
same with lower ... squat focused day, dead focused day... speed , sprint running day...
most upper days i do one leg exercise and on leg days do one upper exercise.. and these are usually supersetted opposing bodyparts
i feel better on this split as i don't push into failure and still make some progress will not hurting my old ass