I think what Button said is right, but not pertinent. I don't think the issue is the endurance-it's easier to get timing right when you're least tired-at the front of the program. After that, what's easier, is what's easier for you personally. Another issue is whether you need to build up a huge head of speed to do your 4t-and thus have no transitions during that section of your program (cf. Plush)-probably easier at the beginning of the program than at the end.
Inserting YuNa into the discussion is

She has one set of abilities, other skaters have others.
Chris Bowman could do 3lz+3t pretty much every time. He could only occasionally hit a 3A and never could get round a 4t. Some skaters have that nice rhythm that allows them to do 3/3's. Consider Kevin vdP who could do 3/3/3 but had a hard time learning 4t (he has it now) and had troubles with his 3A for quite a while. How about Ryan Bradley, who can do a 4t3t fairly often, but has a hard time with a 3A? Different people have different abilities. YuNa can do a gorgeous 3lz/3t and a gorgeous 3f/3t,but she can't point her toe at this point in time, resulting in one of the least appealing spirals I've seen in a top competitor, IMO. Everyone has strengths and weaknesses. They have to do with differences in flexibility, fast twitch muscles, and other basic, inborn abilities, as well as whether a skater trained hard on that particular skill, and whether or not they are a good competitor.
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