anyway, for me.. I would choose SLEC . Only because of the experiences that was shared to me by my friends. They told me that they immediately send the result ( max is 1 week).
here is their website: http://www.slec.ph/
for IOM, they said it is also good to have your medicals there, but i have heard from previous posts ( i cannot remember where it is) that the result is being sent for more than 3 weeks.
this is the reason why i chose SLEC.
NOTE: I am not a member of SLEC nor any of my family, so i am basing my decision based on others experience.
Anyway, the decision is still up to you.