Particle System or Trail Renderer for projectile tracing

Hello everyone, I am currently working on a small MOBA-ish game and I would like some feedback on the current topic.

Should I use a Trail Renderer or a Particle System on my projectiles for my various spells.

Wich one is the heaviest? Which one is the prettiest?

Thanks.

Trail Renderer is probably faster. Particle System makes more overdraw.

OTOH you have a lot more options with PS.