First, I'll be shocked if the A700 doesn't have better battery life than the TF700. Certainly, the A510 has better battery life than the TF201, having a much larger battery. Until they're tested, we have no idea--certainly, we can't go by what either manufacturer is claiming in their spec sheets.
Second, I found the Super IPS+ panel on the TF201 to have wildly variable quality. I personally compared a whole slew of them side-by-side, and some screens had great color, good contrast, decent whites, and good text, while others had washed-out color, poor contrast, a dingy yellow tint, and terrible text. I ended up returning mine directly to ASUS because I got fed up with replacing defective units with ones that had horrible screens.
I do hope that ASUS has this sorted out, because the higher resolution will mean nothing if whites are yellowish, color is washed out, and contrast is bad. In fact, I hope ASUS fixes their quality control issues in general, because the Prime was a mess.
Third, the Tegra 3 in each of these will be pushing 2.25X the pixels of the current crop of 1280X800 10.1" tablets. So, having a 1.6GHz vs. a 1.3GHz processor could be huge for the TF700. There will still be a performance delta vs. current tablets in high-end games, but having a 20% faster processor will be important here.
Fourth, the Super IPS+ mode on the TF201 was definitely better in direct sunlight. It also, however, sucked down battery life like there's no tomorrow. I also found that things got quite toasty, meaning that it wasn't very practical to use for me, living in SoCal. Sure, I could read the screen, but it got so hot that I was afraid something was going to melt.
I'm going to give the Toshiba Excite 7.7 a try before settling on my "final" Android tablet (it's been something of an Odyssey for me so far). I'm thinking AMOLED might give the color and contrast I've been missing, and 196PPI is hopefully close enough to the TF700/A700's 224PPI that text will still be good (which should also generally be sharper with AMOLED). And, a 1.3GHz Tegra 3 should still be quite a bit faster at 1280X800 vs. 1920X1200.
If the Excite doesn't work out, then I'll probably cross my fingers, hold my breath, and give the TF700 a try. I'm wary given my experience with the TF700, but I'm also not necessarily thinking Acer is going to give a better experience.
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