OOTB, the G70 I agree is not the most polished of arrangers when it comes to the styles. But it has, BY FAR, the easiest way of editing them, and fixing them to your own tastes, and a huge selection of legacy styles that are easy to revoice to use the new sounds.
The things that make it my #1 choice STILL, despite four years of potential catchup by the other manufacturers are the stellar piano (and great 76 action to be able to use it), B3 and drum sounds, which, at least for me, makes the great styles on other arrangers moot. If they don't have the meat and potato sounds down cold, what's the POINT of great styles?
Let me add, I do probably as much live band work as machine stuff these days, so those primary sounds, piano, e. piano, organ, brass, strings and synth need to be able to hold up to a live section, not just the washed out drums that most arrangers have.
Yes, the G70 won't wow you out of the box... But if you decide that it's basic sounds are your cup of tea, at least they provide the easy to use tools to redo the styles how you want them... If I owned any other make of arranger right now, I would be SCREAMING at the manufacturer to take a look at how easy Roland make editing, and add it to what I would own.
They really ARE that much better...
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An arranger is just a tool. What matters is what you build with it..!