Linux or Windows?
 

Does it have difference on Which OS trackers runs?

And also could anyone suggest good hosting services for 2000 users increasing fast..

linux, of course ...
for win hosting you will see that you'll need huge resources if you have over 5000 peers ... (not to mention those many, many errors you will receive...)

thanx, anyone else has an opinion?

Use Linux For More Security & Stability :relax:

i never had the chance to setup Windows server successfully I only had the chance to setup Linux server but last one was on Redhat 7.3 so that was long time ago

Most common Linux servers nowadays are Debian based e.g. Ubuntu Server

CentOS has been really popular for many server setup and it does use RPM so it's family of RedHat

Out of linux you can try BSD like FreeBSD or openBSD,

I haven't tried any of the server distribution lately so can't recommend which one to try out first

but for now try the xampp on windows and mess with conf files and php.ini to learn bit more before you can try to setup a linux server

here is a wild guess but try Ubuntu server

i have had windows server for about a month and had no issues at all, but as you say im no on linux, some users noticed perfomance increase im not.. :unknown: