Build advice - Mercenary vs Templar - StrongStabs vs SpellStabs

[MythicFables]

So at the last event I played a mercenary with a longspear and flurry of blows. While I did enjoy it, I 've not had the chance to try out the games magic system so I'm unsure if I'll be missing out if I stay merc on this character.  I've been wondering about a respec over to templar, but as my second game is fast approaching, I'll need to make up my mind soon.

So, I was looking for advice! Think I should stay mercenary and just work on maximizing my spear body damage, or should I diversify and maybe not have as strong damage but have some basic spellcasting for versatility? In general it seems in most tabletop games I've played characters that focused more on versatility, so the idea of maybe having some basic magical protection and healing, with potential for differen't elemental damage options sounds useful to me. But as I don't know how the magic system plays out in this game I'm not sure if that's the best route or even if it's viable?

Just to note, I don't plan on being a full templar healer. My sister is a healer bard, and I don't want to intrude on her focus too much.

Now, If I do stay mercenary, where should I be focusing my blankets? Other then basic useful things like weapon spec and sap, I'm not really sure where my points should go long term?

I'd really appreciate it if anyone could help break the classes down for me so I can make an informed decision.