tough question. But guess for learning the 98 could be the better choice and you perhaps will invest in a bit bigger sized sail, like 6,0 as well.
Out of my view it also depends much, which kind of moves you are planning to practice. If you are more on the jumping tricks focused, I would recommend the 88. If you are planning also to practice slided tricks, I would tend to the 98.
The 98 will work much better with the 5,3. If you alreday know that you will have more days with 4,5 you should decide for the 88.
Hope it helps,
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