Timmies and EGO's are very similar technically.
Weight: Ego slightly lighter than timmy
Speed: Same
Reliability: Ego possibly marginly more reliable
Accuracy: Same
Tech support: Planet in UK, Timmy techs or send to US.
Looks: Both are fantastic looking depending on model
Price: Second hand they seem to be the same almost but timmies tend to be slightly cheeper. New, timmies are more expensive for basic models.
Timmies tend to be slightly harder on paint although various things can be done to combat this.
Hope this helps, I may be slightly biased as I have 2 ego's but my teammates have various timmies so I see them perform all the time.