I've done both.
You really can't compare the two. Racing is just totally different from track events.
First, the budget. You will at least double the cost. If you're spending $12,00 now think $30,000 for a year of racing. That of course includes hotels and food.
You're going to get a lot less time on the track with racing. That to me is a huge factor.
At some point you're going to want to win. That's when it get's serious. That's when you start stealing the kid's lunch money for brake pads.
I would never go back to racing unless I had a huge budget and a really good team. Then again I did it for three years so who am I to give advice.
Just be prepared. Racing is nothing like a track day.
Richard Newton
Porsche Choices