I know that people on Levermir (a flexible 2x daily basal) are adamant that its best for them. I moved from Levermir to Tresiba (a significantly less flexible 1x daily basal), partly to reduce my jabs by one, but also my BG was simply out of control and I felt I was chasing 2 moving targets - basal variation and bolus ratios for food.
Since changing, my basal quantity is a fair bit less; total of 10 units daily from total 22 (2x daily). Now, after small adjustments to arrive at that 10 units from watching night time behaviour, I basically just stick with that - but I'm considering a half unit reduction as the warmer weather takes hold. I'm aware my basal dose is a compromise to suit night time and probably imperfect by daytime. But it is very forgiving. Tresiba lasts typically well over 24 hrs, perhaps up to 40 hrs, so time of taking basal each da can vary quite a lot, although each daily dose is effectively stacking on yesterday's dose. But changes take 3 days to have an effect, thus need preferably 5-7 days between successive changes.
So all control lies with my bolus dosing. I find this simpler. I have clear ratios for insulin to carbs, different at different mealtimes - but these are not rigidly fixed, I adjust from time to time if its apparent they aren't so good. And different pre- bolus timings; 45 mins for breakfast to 10 mins in the evening. But activity means the theoretical dose must be significantly altered. I need to assess before breakfast what my activity level is going to be and apply a correction factor; every day is different. Perhaps reduce to 40% of food requirement if going to be very active most of the day, 50-60% if gently active all day and maybe only reduce to 70% if noticeably going to be less active (I'm rarely totally inactive); Hospital and "sick" days apart. The beauty of this, for me, is if my activity assessment doesn't match reality I can correct either by a snack if low or by a lunchtime bolus for food plus correction if I'm a bit high. Whatever my BG state I'm only juggling with one of my insulins.