Sailfins provide a lot of challenges. They can be flighty at first, but tend to calm down after a minute of being held. They're very hidey agamids. If you're looking for one of the big colorful Philippines sailfins, $800 may be a bit short. I only know of one good reputible breeder (Scott corning) and I would absolutely buy breeder direct. These guys have more particular needs in general.
A tegu is more likely to be "dog tame", even seeking out your affection from time to time. They're husbandry requirements are also a little easier to deal with as they are a hardier reptile.
And that's my 2 cents on that matter. I understand the struggle because I have to make the same choice in a couple years.
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