Let me say first that both are good quality products and will stop you slipping on your mat. I don't think you'd be disappointed in whichever one you were to buy. That said, if I had to choose just one, it would have to be.......
I used the Yogitoes solidly for a couple weeks after It arrived and was very excited about it, but I've found that in the last week or so I've been going back to the eQua.
For some of the extra curricular practice I do, I tend to pick up the Yogitoes. It grips right from the off and is good to go. But for a full practice give me the eQua every time. Yes, you may have to give it a spray with some water first, which might be a pain if your taking it to the Shala. But it grips the mat like a second skin and almost never bunches up. I started to find the Yogitoes bunching a lot, which became really irritating. It's because it grips a little too well to your feet as well as the mat. The equa is almost like suede, your feet just seem to glide over it when they're moving and yet when your standing or pressing your hands down and want some grip it stops you slipping just fine.
The Jump back is important to me as you know. When first learning it, you want all the help you can get. You don't want the mat bunching up every time you brush across it which can happen with the Yogitoes. Jumping through on the eQua is perfect, if your toes brush along the surface of the towel it's fine because of the suede like texture, they just slide right through. No mat burns on your toes with the eQua.
You do tend to feel the the little silicone bumps through the Yogitoes. You get used to it in standing but it can be irritating in forearm stands, that said I do like the feeling of extra grip for handstands.
There's more to the Yogitoes, it's a little thicker and will absorb more moisture perhaps, though the eQua absorbs more than enough for me and I'm a very sweaty Ashtangi. Best of all after my practice I tend to give the eQua a rinse out in the shower. When you wring it out it's almost dry right away, something to do with the microfiber. Can't say the same for the Yogitoes which will take much longer to dry and being thicker is harder to wring out.
If you do go for the Yogitoes avoid the ones with the emblem. Mine has the Japanese character for wood but my foot always ends up sticking to it such that I have to have the mat turned around, the emblem at the back.
Used to be that the eQua only came in bright green but now I believe it comes in a couple of other colours, I've seen the red one online which looks great. Also you can choose an extra long towel to fit the extra long Manduka. My towel is extra long but my mat is normal size, not too much of a problem as the towel just folds over the end and still seems to grip OK.
Stop press. According to Maduka's website they have a new improved design out now, looks pretty similar to mine but a little thicker and plusher. http://www.manduka.com/store/product.php?productid=16325&cat=258&page=1
And her's a link to Yogitoes website