I would suggest to check out both, cant hurt to have a bit of knowledge of both platforms. And thats probably the best way to find out what you like best.
Agreed, however there's a danger in learning both at the same time if you're a beginner.
PHP and ASP.NET operate on totally different paradigms and modus operandia, yet they both look and feel the same in source view.
Yes I agree, it might be confusing to do both things at the same time. Probably better to stick to one platform at first. Then reset your brain and check out the other one .