What unsuccessful console has the best third party lineup

[Leynos]

I will throw in Neo Geo CD. I say CD since AES was meant as a niche device and was supported from 1990 well into the PS2 era. CD was mostly ports of AES games but on CD. Why do this? CD's were cheaper than the 200-$300 carts. It did have poor load times but then they released the Neo Geo CDZ witch improved load times.