Should I use MyISAM or InnoDB Tables for my MySQL Database?

Question

I have the following two tables in my database (the indexing is not complete as it will be based on which engine I use):

Table 1:

Answer 1

MyISAM won't enable you to do mysql level check. For instance if you want to update the imgId on both tables as a single transaction:

START TRANSACTION;
UPDATE primary_images SET imgId=2 WHERE imgId=1;
UPDATE secondary_images SET imgId=2 WHERE imgId=1;
COMMIT;

Another drawback is integrity check, using InnoDB you can do some error check like to avoid duplicated values in the field UNIQUE KEY imgDate (imgDate). Trust me, this really come at hand and is way less error prone. In my opinion MyISAM is for playing around while some more serious work should rely on InnoDB.

Hope it helps