NT server, pro/con

While working on an assignment to choose a database product, I've just been asked to look into using an NT server rather than a Sun Solaris 2.x server. I'm interested in hearing people's evaluation of the merits and demerits of an NT server in a server/client RDB environment. Speed, reliability, security, expandability, ease of learning the system administration work, ease of performing it--talking here about the NT side of things, not the RDB side--are obvious areas of concern. Are there others? How does NT stack up, to date? As you may have deduced, I have plenty of Unix experience, none with NT. Will be glad to post a summary, or to forward to individual responders. Tia, Steve