[Shiner]

1. Which ending is better

It's down to opinion really, i like the bad ending personally.

2. Which way gives you better rewards

Saving them gives you more stuff
(Plus, its required to get the 'Tonic Collector' award)

3. Which way is easier

Saving them is easyer, because you get ammo ect. from the rewards you get.

4. What I will be missing out if I pick one over the other

if you harvest them, you can't get the Tonic Collector achievement.

(i just wrote this and realised your on PC so you cant get the achievements lol)