Out of those two the s601 is definitely the more capable device. It emulates everything up to PS1 really well and there's also quite a lot of N64 games which work fine too (more of a control issue than a processing power one). As it runs Android there is always going to be new software available,
Not had any experience of the A1000 but from reviews it seems like it's on the same level as the A320 without all the extra native and Dingux software which that console offers.
Thank you too dude I'm highly convinced now!
One more thing i forgot to add, does it come with RCA TV out cables?
If it doesnt would my Dingoo 320 RCA fit? Just curious thats all i seen a lot of
guys on youtube with tv/out in their cool videos.

it does not come with the stereo like plug to rca out, and I am fairly confident that the tv out doesn't work in the version that is supplied.
On all the listings it says "tv out available as upgrade" I think they meant this as an actual firmware update rather than upgrade. Good and/or bad news is that the hardware is there, and it works, it's fuintion is just not enabled in the software.
More better news I just found out today is that the hardware (aml8726-m3 chipset) used in the JXD S601 has an android 4.0 port done to it out in the wild now. Not sure how long that is going to take to trickle it's way to our device (if it ever does) but it's definately on the realm of possible. And if not offically, source shoud be released at some point that would allow us to do it ourselves if not officially.
And to re-itterate, if comparing the JXD 1000 to the S601, it's not even a competition, the 601 kills the 1000 in available software, specs, openess, and build quality. Comparing it to the already mature Dingoo... thats a tough call, if enough people jump on the S601 wagon it has potential to be the next dingoo if you ask me.