I have often said that, when push comes to shove, the available style choice should be your primary reason to get any particular arranger. Features are good, sounds are good, but if you primarily play in arranger mode, nothing is more important than the selection of top quality styles in the genres you use MOST...
And, from everything I've heard, each arranger is better in some areas than others.
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An arranger is just a tool. What matters is what you build with it..!