I have found more and more that analytics doesn't give you much. Feeling is far more important, and looking at basic data from your rides, e.g. if you have a 1-month block of Vo2 specific work, and again say 3 months later, you can see if you are putting out more power for fixed durations or not. You can feel if in one day your legs held you back, you don't need fancy analytics for that, before even looking at any data you will know if it was a good session or not. You can learn yourself which HR zone is your Vo2 max zone and from that and your rate of breathing if you are in it during a session or not.
I do use Strava (paid) and Golden Cheetah, but more to track the bigger cycles and help me see some numbers, a few of which I copy into Excel for long-term tracking.