For me, the difference between the 2 devices is quite distinct and so a decision is relatively straight forward if you know what you intend to do.
If you have a touring or audax/long ride bias (i.e route finding/following) then the Vista - or indeed an Etrex - is the one you want. If you are more sports minded, and are interested in how you perform on that ride (speed, heart rate, cadence) then I reckon it's the Edge you want. Whilst the Edge 705 offers route finding, it is (imo) a compromise and if you are interested in it's route finding/touring potential then I honestly think you're better off with the Vista.
I had an Extrex in my early audax days. I liked it (though it did suffer from the known random power-off problem which I resolved by sticking a bit of paper on the batteries to stop them bouncing) and it was great for route following... but I also had a cycle computer to give me speed, time and cadence. PLUS I wore a heart rate monitor with the watch on my handle bars. And then I had lights... so my bars were getting full of bits.
To me, the decision to get an Edge 305 was obvious. It replaced three bits of kit with one AND freed up space on my bars!
If you have a touring or audax/long ride bias (i.e route finding/following) then the Vista - or indeed an Etrex - is the one you want. If you are more sports minded, and are interested in how you perform on that ride (speed, heart rate, cadence) then I reckon it's the Edge you want. Whilst the Edge 705 offers route finding, it is (imo) a compromise and if you are interested in it's route finding/touring potential then I honestly think you're better off with the Vista.
I had an Extrex in my early audax days. I liked it (though it did suffer from the known random power-off problem which I resolved by sticking a bit of paper on the batteries to stop them bouncing) and it was great for route following... but I also had a cycle computer to give me speed, time and cadence. PLUS I wore a heart rate monitor with the watch on my handle bars. And then I had lights... so my bars were getting full of bits.
To me, the decision to get an Edge 305 was obvious. It replaced three bits of kit with one AND freed up space on my bars!