It depends what you want to achieve, how much time and money you have and why youwant to fly. If you have lots of money and very little time, stick with power flying. If you want a more sociable environment, where you are a member of a Club, rather than just using the airfield as a means to an end, then come glding. If you want to use aviation as a way of travelling from A to B then power flying is much, much, better. If you enjoy the challenge of using the weather conditions to help you with your flight and can cope with making changes to your plan every few minutes, go gliding. If you want to fly and achieve the buzz of keeping to a particular height, speed and heading +/- 2% by using instruments, then go power flying (but please keep a good lookout for the rest of us). If you fancy the idea of deadreckoning, constant heading changes, using lines of energy to help and not having to talk to ATC, then go gliding.
You'll also find that different gliding clubs operate in different ways too. If you go to a small club, run by members at weekends, the you'll sometimes spend much of your time helping out on the ground and perhaps not do much flying. The more professional Clubs (by which I mean they have a paid fulltime staff) offer a much beter Value for Time proposition (including bookable training).
Dependign upon where you live, go and check out the flying clubs and glidign clubs and see which gives the most buzz. f you have lots of free time, money and inclination then do both!