I graduated may 2010, and left the Nevis part August 2008. Regarding easier, I doubt either one could be considered easy from a purely academic standpoint. My information is that the academic portion is almost the same with minor differences.
Here are some important differences I've learned of;
1. SABA is an EXTREMELY small and socially closed island. You hear surprisingly little about this. Alslo, living Supplies are very limited and the change in living circumstances is absolutely OVERWHELMING for many students, particularly those who've never lived away from home before. This causes a percentage to just leave early each entrance. Moving to a smaller island like Nevis is too much for some, but I get that SABA is 10X as schocking a change thatn SABA.
2. SABA has a cut-throat feel to it. Students are competitively pitted against eachother, somehow, I know not how, but it's real.
3. MUA is more or less friendly. Students help eachother, and professors help students succeed.
4. Nevis is a big enough Island to have some variety in supplies and social life and resteraunts, and also is a short ferry ride from the larger St. Kitt's (Casino, more doctors, etc.).
5. SABA is california approved which is very important to some people.
I think the overall experience would be easier at Nevis, but I'm not speaking of academics.
Curious to hear other's opinions.
Best of luck and either way it will require some flexibility in your lifestyle, tolerance and patience, and a lot of daily hard work (including weekends), unless you are academically gifted.
STEP 3 - PASSED