which battery terminal ends should I use?
 

So I'm relocating my Optima to the trunk of my 69 Firebird and it has both end types. Which do you recommend?

Top posts have the most surface area for contact.
Top post, sometimes bending the cable in a compact area is an issue
Top posts, big nasty grower of green and white stuff, fun to hose down in the trunk or battery box.

Side posts are the cleanest install.
Side posts the cable is already heading in the right direction.
Side post watch out for the battery bolts bottoming out in the battery, if they bottom out or are close it will (can) destroy the battery. (you are screwing a bolt threw the battery wall, leak leak drip drip, ask me how I know.)

Mick

I like side posts.....especially in the trunk.

I used the side posts with the battery in the trunk, too.