terminal server security Vs. vpn

Hi,

I am looking for a solution to my users so they can log in from home
and work connect to there office pc's, of course I will use terminlal
server.

My question is, why to use double encryption, why use vpn client to
connect to the corporate FW and then to connect throw it with a ts
session, AFAIK Ts is encrypted as well and one can set the encryption
to high which is the same as VPN right?

I want to nake the connection simple to the user and securure. do I
need also a vpn client, I guess not, am I missing something here?

I will also change the port to increase security.

Thanks a lot,

Juan