Should we go for /16 or /24 while designing the segment?

We just acquired a new facility and are re-assigning a new IP segment for it. There are about 90 users and 120 computers/network devices in that facility.
Based on what we have now we would like to assign the segment 10.1.16.0. My boss tends to use
10.1.16.0/16 for it but instead of such a big segment I suggest using three smaller segments:
10.1.16.0/24 for data
10.1.17.0/24 for VPN
10.1.18.0/24 for voip

Can you comment on the above two proposals and give your suggestion please? Thanks.