it depends on uses, either way i'd hold out for teh tegra 3 chips that are coming out in the next 4 months or so..
i currently have the transformer prime and honestly it kills in terms of speed and multi tasking, plus it has a 4 core processor and an additional core as well for running simple tasks, it's pretty sweet, already been rooted and overclocked to 1.7 on the 4 cores as well, the bonus to having so many corse is that when your doing simple stuff the tablet runs off the 1.2 single core processor saving battery power but when you need more power it kicks the tasks over to the quad core processor to get the work done...basically it owns and buying anything else except a quad core tablet at this point is a bit of a waste of money, meaning that 1/3 of the tablets out there are already obsolete and the nicer higher spec'd tablets currently on the market will be obsolete in 6 months to a year as opposed if you get in on the quad core now you've got a full year to 2 years before your behind the times and you get stuck with lagging apps and all of that fun stuff...always a a worry when buying any new tech, how long will it be useful until the industry has moved on to a new platform or new hardware spec as standard....
that said, unless you're a simple user don't get the tf201, or transformer prime quite yet, they are having some issues with the q/c process and bug at this point, i'd hang tight until they get things worked out.
after giving the tablet market time to to grow, ICS to finally be completed and pushed out and the hardware specs at a decent level it was now time for me to buy a tablet.
why i choose the prime:
i wanted a keyboard as sometimes i can make quite long posts on here and various other forums, along with work emails and all of the rest, i find touch screens annoying for writing anything of depth or substance , so having a tablet that was made for an accompanying dock/keyboard was top of the list, not to mention extra usb ports and an extra 8 hours of battery life for long flights - i think combined it gets somewhere around 18-20 hours moderate use
try the XDA forums those guys know what's up and can help you root through your needs and wants to help find a tablet that suits you, everyone's needs are different, the GPS on my tablet sucks but i have no need for a 11 inch GPS device in my truck and would never use the tablet for in car navigation, i have my phone and stand alone GPS device for that, some people did plan on using their tablet as a GPS device so they returned it, this is the major issue with my tablet at the moment, is very weak GPS performance...seriously though head over to XDA and start your searching there, they know everything about every device.