I love SG0 more than the original series, because it elevated the original even more. Also, I find the Sad Scientist a more compelling character.
spoiler
The revived Mad Scientist is just as compelling
On another note, I liked Okabe x Kurisu on its own after I watched the OG, but SG0 made me like Okabe x Mayuri better.
I like how 0 expanded on the original but I also think the original can hold on its own.