I'd recommend a burm over a yellow anaconda for a "first big snake" any day of the week... except anaconday!
Annacondas can be vicious... if you have no big snake experience, how will you care for a potentially 10ft snake that wants to tear you open?
Mind you, burms can be mean too, but its much more common in anacondas.
I suggest you find somebody who owns the snakes and check themm out in person before you make your decision. Ever seen an 18-20ft burmese? Been chewed by a 9ft yellow anaconda? I have and I chose the burmese python route![]()