There is something to say for both. Server+ may be a good basic preparation for MCSA/E, but Network+ will give you a sound networking basis, also covering some 'older' network technologies that MS exams don't cover, but assume you 'know', and can also be used as a basis for CCNA. It's either system (/server) administration basics (Server+) or networking basics (Network+)... both are useful in most IT jobs, so I agree with Jrowe: in that case it's going to be a matter of personal choice.
I took both myself and actually thought that Network+ was more valuable to me. Server+ just seemed to be a regurgitation of Network+ and A+. The only important thing that most people would take away from Server+ is a solid understanding of SCSI and the different RAID configurations. While that is very important, you can learn a vast majority of that information in A+. The added information from Network+ should really broaden your knowledge and make you a more complete techie.
Net+ is almost theorical information and there is othing to do as a simulation on PC it contains the understanding of Network theories thts wht i deduced from accomplishing the NET+
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then you can use net+ and A+ as your elective for MCSA
in that case it's going to be a matter of personal choice.
net+ is the more popular of the 2
try comparing the objectives for the two and see which one you would be more happy studying.
Cheeblie