For me, I'd surely choose Evo IX because:
1. Engine is more conventional and should be easier to maintain.
2. Most std comparison head-to-head of the same generation, Evo almost always is faster be it in straight but especially in the corners as it can turn sharper while the WRX tends to understeer more.
3. IMHO Evo looks way much better cause I don't really fancy the V9 wing and grill even though not too bad and much better compared to earlier version 7 & 8. My fav Subaru is actually the old version especially the 22B STI.
4. For me, Evo IX front seats also fits better & looks much better even though the rest of the interior lost to the WRX. But the driver seat is more important than the rest especially for a driver's car like this.
Evo IX is simply still one of my dream car. If only my wife approves. :(
All this might change though when the new WRX V11 later come out. :)
---------- Post added at 07:56 PM ---------- 6 hour anti-bump limit - Previous post was at 07:52 PM ----------
I've searched and read before several EVO VS WRX STI topics at here before. From what I've learned from replies here, most of them are
Lancer Evolution
-Easier and cheaper to modify than the Impreza WRX STI
-Easier maintenance and service (straight 4 engine vs flat 4)
-Seems to be faster at straight roads
-I've also heard that Evo clutch worn out quite fast (not sure about Impreza WRX STI)
Impreza WRX STI
-Unique and nice boxer sound
-Better handing at corners compared to Evo
-Price usually are slightly cheaper than Evo
-Frameless doors (GC8 and GDB only)
The one in bold, not really true also. Evo also still faster in corners most of the time.