Rotax or Jabiru powered LAA aeroplane every time! Mine costs peanuts to run and outperforms a c152 whilst burning half the fuel.
CofA aeroplanes (as opposed to LAA Permit to Fly aeroplanes) will always cost you an arm an a leg to run, for no real advantage unless you require flight in IMC or need to use it for aerial work.
My costs are £22/hr avgas £8/hr oil/engine fund/tyres+ brakes/filters/contingency.
Permit renewal is around £100/year. Hull insurance is £1400/year and hangarage is £1200/year. The airframe is plastic so pretty much looks after itself with no fatigue issues or fabric woes.
If it were a Cof A aeroplane I simply wouldn't be able to afford the annuals.