2008 avid juicy ultimate vs 2015 shimano slx disc brakes!? Which do I keep?

Just bought a 2008 spesh enduro which has a if juicy ultimates. Wondering whether to put my shimano slx on from the trek remedy I'm selling.
Do I go for newness over original cost? Is shimano reliability/simplicity the winner?
Help!
Do I go for newness over original cost? Is shimano reliability/simplicity the winner?
Help!
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It's a no brainer
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Strange comment ...!?
Never had any issues with my ultimates and had looooodsa power due to huge leverage on 203mm rotors.
The lever feel was also spot on.
Like xtr brakes they use better pads ime.
Not really, Avids are 7 years older than the Shimano's and are generally less reliable.
That.
Road - Wilier Izoard Centaur/Cube Agree C62 Disc
Allround - Cotic Solaris
If it's easier for op to keep the ultimates then I would do that!
Going from Juicy ultimate to SLX will be even better. Just keep the 203 discs.
(Simple)