hi manar
thanks for the kind words. as you can see, either bohol or malapascua wont dissapoint dive-wise.
like i mentioned in the post above if your looking for more things to do topside then bohol should be your choice.
also you can go dolhpin watching in bohol and if your luck enough to see a megapod ( i saw one back in 2005) then you will see thousands upon thousands of dolphins! im not talking about 5,000 here, im talking 25,000 or more! i havent seen anything like it even in blue planet or discovery. totally amazing. everywhere you look dolphins everywhere. no diving though in that area as it is open ocean. but even then... one of the most amazing thing ive ever seen.
with regards to malapscua though, threshers are beautiful but i go there mre for the mantas. and as you can see they arent small. the first manta in the vid was 15-16ft. add 25% to that u/w and it looks huge!
either way man, you cant go wrong for your sister diving-wise. but as a tourist you see more things in bohol.
send me a pm if you want some recommendations. id be happy to help.