Hi, I looked at the ingredients for the Eat Natural bars and I personally wouldn't choose them. In addition to puffed rice (with added sugar) they have glucose syrup, honey, and a lot of dried fruit in them.
I've had 9 bars as a snack before but only when I needed a 'substantial' snack (i.e. it was 8 hours between lunch and dinner and I was having a snack in between) as they're quite high in calories, and only when there wasn't a better option available to purchase, as they still have added sugars (but not things like the rice and fruit to raise the GI even more, and the high seed content balances things out a bit better).
When I have eaten an Eat Natural bar in the past, my impression is that it spiked my blood sugar much more than the 9 bar did (based on how 'buzzy' I felt), so in a pinch I'd choose the 9 bar. If available, though, Nakd bars are a better choice (in my opinion anyway).