It doesn't matter where you buy, 148K Staroptions have the same value. However, as a Kierland owner you can make a reservation for your home resort at 12 mos. and you can't (try to) make a Staroption exchange to another resort until 8 mos. out.
How easy the SVN is depends on where you want to go:
St. John exchanges - very difficult
Harborside exchanges - difficult
Hawaii Exchanges - getting easier with more resorts
Every where else - easy at 8 mos. out, most of the time, except holidays