I like both citra and simcoe. I've made a very good IPA using those hops (along with cascade and summit). Yes, it was very fruity, and the aroma and flavor profile did change over time (less peach/apricot within weeks).
It is hard to find good info about various hop profiles. Wiki is weak in this regard. You might find this site helpful--it does a good job listing various flavors and aromas you may encounter. I find lists like these helpful when creating recipes or trying out a beer that uses a hop I haven't encountered before. http://roguebrewers.com/Hop_Profiles.html
. It states the following:
CITRA 10-11% All Purpose
Very fruity Citrus, peach, apricot, passion fruit, grapefruit, lime, melon, gooseberry, lychee fruit, pineapple, mango, papaya and other tropical fruit flavors and aromas. A very new high alpha Hallertauer Mittelfrüh, Tettnanger, EKG hybrid with distinctive citrus aroma.
Use For: Pale ales, IPA
Substitutes: Simcoe ,and other fruity citrusy "C" hops
SIMCOE - 12-14% - Bittering - Flavor
Aromas of passionfruit, apricot, Intense pine and woodsy aroma adds to the fresh, youthful vigor of this complex hop. Dual purpose but generally considered a bittering hop.
Used For: American Ales, IPAs, Double IPAs
Subs: Amarillo Cascade Centennial (a blend of these might come closer)