There really shouldn't be all that great a difference between FAA and ICAO holding entry. Yes, to tell the truth, it is a parking lot, do 360s, if you want and can stay in the airspace. But, practically, the three ways are pretty much it. If you are in a jet, at or near, maximum holding speed, the correct method will ensure staying in the hold. But, in a small plane, probably anything will work, as you are not eating airspace quickly. OTOH, being real picky, to the degree on the course approaching the hold, whether it is track or heading, etc. it will not a make a
difference if you use parallel and I grab the teardrop (offset) course.
Now, about those course reversals for non-radar approaches, WORLD's of difference between the two.
GF