It’s arguably slimmer or arguably better because it didn’t have an OLED? I guess I was under the impression that other than lifetime and pricing, OLEDs were the best displays available right now in terms of quality, efficiency, and thickness.

Sorry, I was perhaps being a bit too clever with my comment. I meant, the only reason the Slim is only "arguably" better, as opposed to "clearly better", is because of the lack of OLED.

No, but it's much nicer to hold, comes in a bunch of cute colours, has a 1GB internal memory (so you can actually save games without immediately buying one of the dumb memory cards) and uses a standard charger.

1GB is near useless for the Vita. I think Killzone had an 8GB day one patch or something? FFX/X-2 only had X on the cart so you needed to download X-2 anyways and it wouldn't fit in a gig. Plus a ton of games skipped retail releases outside Asia or just in general like Minecraft. My 1000 series came with a 4GB card in a bundle for the same price. I still upgraded it soon after because it got filled fast.