Is switching between 1 extra leg day and 1 extra upper body day for a weekly workout counter productive?

I workout 4 days a week, 2 days upper body (bis/tris/chest/back/shoulders) and 2 leg days. I want to workout 5 days a week, doing 6 is too much for me in regards of free time. I’d like to have at least 2 active rest days where I can just do cardio or maybe even nothing at all.

With that being said is it pointless to split that 1 extra day between each week? Like let’s say this week I hit legs x3 times and upper body x2 times but next week instead I hit upper body x3 times and legs x2 times.

Will that be a waste of time because the week long gap of one less/more session? Is it best to choose only 1 of the 2 muscle groups to do an extra day of? My goal overall is to just put in more work and see results in my strength and muscle gain. I do enjoy working out but upper body more than legs but don’t feel like working out 6 days a week so both get the same amount of work put into them.