The Felt has a Rockshox Recon Silver TK solo air 29 fork while the Scott has a dual air RS Reba with negative air adjust. This is two grade better at least with no need to upgrade. Scott has geo from their XC World Cup race program(they just won again.) short chainstays, compliant seatstays and slack HT angle.
Seats end up being personal and are often changed out. If you haven't been riding alot you will need to break in for a few hours. If you have been riding alot use that seat. I use my 135g SLR off my road bike.
I was at a Niner demo Tuesday and road the Air 9 RDO. The brake set was 2012 XT. That is a very powerful one finger rear half or less finger front set. The SLX is the same and either is a good option as an upgrade for any Elixirs The RDO is a light stiff frame with very quick steering. The 71 HT angle is not as stable as a Scott. I didn't quite get used to it.