Slim is better in every IMPORTANT way and also better comfort (no propietary charger, more options to expand memory).
The only thing the normal model has over the slim is the screen and that's not important at all (despite what it's supporters will try to make you believe, which is usually their only argument).
Nothing beats being able to charge your Vita with anything, having internal memory for easier hacking and just being able to use any SD just like that.
Heck, you can even try to simulate something closer to the OLED screen with a simple homebrew that alters the graphic values
I would say the opposite. The OLED is better in the important ways because the ways in which the Slim is better are easily fixable.
1. Proprietary cord. Easy Fix: Amazon has high-quality replacements.
2. Internal memory. Easy Fix: Japanese eBay sellers sell 4GB cards for $7. SD2Vita also costs around $7.
3. Better comfort. This is completely subjective because I would need a controller grip when playing either Vita.
In contrast, the ways in which the 1000 are better, or can we just say "different," have no easy fix. The device has a heavier, premium feel. The screen is OLED. The sticks are hall effects.
Will everyone prefer it? No. But the Slim's benefits are more just conveniences in my eyes. The fat's benefits are the build quality itself, which can't be easily replicated.
1000: prone to GPU crash when it is overclocked
Could you please provide evidence or an explanation for this? It's my understanding that the Vita GPU is severely underclocked by default. Popular plugins like PSV Shell Plus "overclock" compared to the manufacturer's specifications, but the GPU is still rated up to 0.8 GHz, and most plugins still cap at 0.5 GHz. As I understand it, the only effect it will have is on the battery life.
I'm not an expert, so I want to know for myself and others if you or anyone reading this has evidence for this because this is not a generally accepted fact that 1000 models crash. Otherwise, overclocking plugins would not be so popular.