There are good reasons why basic training is almost always done on simple aircraft such as the 152, 172 or PA28. They are easy to fly with no surprises to bite the inexperienced student. Once you have the basic skills sorted to pass your PPL you can build experience and move up to more complex types with CS props and retractable gear. Higher performance types such as the SR22 are slippery beasts and more demanding of your handling skills.
School and club aircraft are usually fairly old but they should be well maintained and reliable. They do a lot of hours and take a fair bit of abuse from students so they need to be rugged and the interiors tend to be a bit tired from use - some more than others.
The common factor is that they need to be cheap to run because PPL training prices are very competitive.
Insurance companies are not going to like a low hours pilot in a new SR22 so rather build your hours and experience renting until you are properly ready for a high performance type and the insurance companies think that you are an acceptable risk.