Mr trollface: you mean like this? (throws an egg at him). I feel like it would be better for her to learn logical senses, like chemistry or physical buildup, i mean, sure, throwing yolks at people IS fun, but will it really help her??
Astra: trollface is better to start learning if you plan to be fighting powerful beings, close range combat is important but if you're fighting someone who can turn you to ash instantly if you get too close it won't be that helpful.
Eggy on the other hand has experience fighting beings like that, like inkmatas for example. So he's better for more advanced training. He also knows how to fly which is a helpful thing to know.
So I guess it depends on what you're trying to learn.