I had a thread similar to this a few weeks ago.
A lot of people said you can do both with some of the newer sets like wizards ripstoe.
What I ended up doing on my healer is running 5 heavy seducer which gives good recovery while still being very tanky.
I also run sword and shield for that extra blocking.
This is PVP btw, not sure how pve would work.
I want to try out a Templar tank/healer but I'm not sure if I should run with 5 light or 5 heavy armor, any suggestions would be appreciated.