The answer will depend on your requirements and what you can get.
The typical UK rental plane is a piece of junk so people who want something nicer either look for syndicates, or buy their own.
But there are exceptions - some schools have nice modern fleets, and then it's hard to justify a purchase (share or whole) unless you are doing a lot of hours or want longer trips away. A huge part of the case of a purchase is to get a reasonable quality plane, with availability for trips away etc.
If you definitely have no touring requirement then presumably you will not do many hours a year and the case for renting v. purchase will hang entirely on whether you are happy with what you can rent.