Gertrude is exaggerating somewhat of course about flying twice a day
Without a doubt, the cheapest way to fly regularly is by joining (or putting together) a syndicate.
Outright ownership is the best for total access, avoidance of disagreements over the standard of maintenance, etc, but is obviously the most costly option.
If you can afford to own outright, DO SO, do it early in your aviation "career" (before you have wasted too much money on renting old junk) and you will not regret it for a second.
There is a general observation in aviation that the people who are happy are those who are doing something which is within their financial means. The trend is for people to keep moving up and eventually they end up flying something which they can't afford. The trick is to find a point at which one is happy financially but still gets value out of it.