Your best bet is to find someone well before the earliest your contact can make the reservation. For someone who owns at Animal Kingdom Lodge, that would be 11 months to the day of the start of your vacation. For a
DVC owner who does not own at AKL, that would be 7 months to the day ... etc. etc. Starting out this early is great!
As far as studio vs. 1 bedroom, I'm not familiar with AKL so can't speak to which would be 'easier'. From the perspective of renting points, it should not matter (though it will cost you more $$$ for a 1-bedroom, as it will 'cost' the DVC owner more points.) Now that I think of it, though, it might be technically easier to get a studio simply because there should be more DVC owners with the smaller number of points needed for a studio available to rent. Note that "more DVC owners" might simply mean that, from a pool of 3 who have enough points for a 1-bedroom or a studio you jump to a pool of 5 who have enough points for a studio - in other words, there may or may not be a large difference in the number of people with enough points for either option. Of course, there may be fewer studios to be had in the resort -- again, hopefully you'll get some input from someone else with more AKL experience. ;-)
As far as better off -- it depends. Seriously. To get a room in a DVC resort from a DVC owner, you enter into a contract with them. Generally such contracts include such things as "pay some % up front which is completely Nonrefundable" and "Absolutely NO changes can be made to the dates" in addition to the normal issues people sometimes have with a timeshare, such as the fact that you will only get housekeeping services about 3 times during your 10 day stay. To get a room in a DVC resort from Disney, you enter into a contract with them. Generally such contracts include things as "pay some % by a certain date, all of which is refundable if you cancel before some short period of time before your initial dates" and "you can usually add or subtract days to the contracted stay" as well as the fact that you will get daily housekeeping during all 10 days of the stay. The difference in total price between the two is usually significant and that's why people look to rent from a DVC owner instead of directly from Disney.
So. #1 - are or will your dates be 'set in stone' prior to 11 months before your trip? #2 - if so, look to the Rent/Trade boards here on Disboards to try to find someone who is willing to make a reservation in your name at AKL. You should also peruse multiple 'middleman' sites such as the one you'll find known as "David's" that advertises on the Rent/Trade board. #3 - enjoy your trip, regardless of how you go about getting it set up!