thank you for the comments and pictures.
i read that yellow fat is a sign of a grass fed animal and i really (by instinct?) love the picture of those meats from the phillippines! when i asked the salesperson in the shop about yellow fat he frowned and said "yellow fat is bad because it comes from old animals and you don't want to eat old animals because they taste bad". all young animals have white fat, he claimed, and also that the very best cuts are the ones with very dark color and white fat. my tastebuds disagree with that, sadly.
i guess the meat itself tastes better also when the fat has the right color (and tasty contents). because even the meat has some fat in it..
a lot of the cuts i see have very little fat "in them" but on the edge there is this thick part of fat, very hard and white. a typical grain fed animal is supposed to have a lot of fat "in" the cut as well making it look almost white, was something i read also. but maybe they can be grain fed with white fat and no intramuscular (?) fat?
i saw a heart though, and it had some yellow fat around it, so there is hope i think

regarding taste: i tried a cut with white fat and a kind of a greyish color in the meat, and it (the meat and the fat) tasted like cheese! very weird even though i liked the taste (and smelled like cheese for hours it seemed). has anyone else experienced something similar?