PPL is the hardest course. You are learning to fly from scratch and every other course builds on that basic skill. It's quite common for people to go "over-hours" on a PPL but virtually unheard of on any other course (you'll probably need every one of those 45 hours for a PPL but you might be ready for the IR after 20).
To answer the question, no one cares where you got your PPL from (personally I would go to Como and do it all on floats!). But choose wisely because your target should always be to pass your test at 45 hours. You do that by:
1) Getting a Class one medical and passing all ground exams before touching an airplane.
2) Choosing a school which can keep you flying 5 days a week and get you through the PPL in under 6 weeks.
3) Avoiding a school where the instructors are inexperienced or obviously hour building and motivated to make you fly excess hours. It happens a lot.
4) Choosing a school with great weather and aircraft availability. Weather is a huge factor.
5) Learning in a 4 seater (even if it is more expensive) - you can backseat others and get twice the learning
The airlines often say 3 schools max, but they will only know what you mention on your CV, so you might say CPL@School A, MEIR@School B, MCC@School C - when actually you did your PPL at school D, Night reading at school E, some hour building at school F, IRR rating at school G and CBIR at school H. You just don't write that down.