The
ICAL TESL course is a good choice.
hypiereon summed it up very well! Longer courses by 20 or so hours wont improve your chance in gaining a higher paid teaching job. Schools will only want to know if you have a TESL Certificate or not. If you do, then they will want to know if it's a TESL course they have heard of. That's why I recommended to go with well known TESL courses.
Be sure to choose the TESL Course with the subjects that
interest you most. I wouldn't base your decision on web colours or price, since most prices are all very similar. Whilst the ICAL course may be 8000 yen cheaper, it should be only a small factor when making up your mind.