1. ProTools is the way to go for heavy-duty pro recording, but it does involve purchasing additional Pro Tools-compatible audio I/O hardware, some of which is quite expensive. Digidesign did put out a freely downloadable, software-only Pro Tools product, but that was designed for Win 98/ME. Even when run under those versions of Windows though, most people ran into hardware-related compatibility issues of some form or another. I remember trying to get it to run on three or four different Win 2000 systems, with absolutely abysmal results.
Given that, software-only PC solutions like Sound Forge might suite your particular needs (and system configuration) just fine. If you really want to "go pro" though, let me what sort of studio setup you're shooting for and how much $$ you're thinking of spending.
2.
At the same time ive heard that the PC version, altough greatly improving, still lags behing the Mac version
The underlying reason for that is mostly due to the differences between the Mac and PC hardware architectures; it has little to do with software.
The major issue lies with signal-processing latency/timing. As I'm sure you know, doing "real time" audio or video processing (and having it turn out "glitch-free") is very system-intensive in general, and becomes even more so when working at higher bit/sample/clock rates. Without going into details, the hardware design of Mac-based computers basically has a shorter "pipeline" through which your record and playback signals must travel, making it much more …