Heres some side by side comparison of sir prize and pinkerton. I like to do these side by side tests. You can't really gauge the flavor profiles well without doing comparisons at the same time. These are both great avocados. The trees aren't the greatest growers but that may be because they both fruit so heavily they don't have energy to really grow well. Fruit thinning or stripping would help here.
The sir prize fruit has a much softer skin and turns black on the tree while still hard. The pinkerton has a thick hard green pebbled skin. I really like the harder skinned types as the animals (mice and birds) can't see them as easy and can't peck or chew into them as easy. The only downside is its harder to tell when to harvest the green skin fruits.
Sir Prize is more creamy and soft where pinkerton is more dryish. The pinkerton has a really strong avocado flavor. Very nutty and straight forward flavor. Excellet flavor. Sir prize also is very good in the flavor department but does have a faint anise taste that I don't care for. Sometimes I pick up the mexican anise flavor in hass also. Its most apparent when the fruits are extra ripe. Sir Prize has a better seed to flesh ratio but maybe not quite as good for pure taste.
Pinkerton
Sir Prize