RE: New F18 70mm size
IMHO the Red and Gray is easier to see...
I would recommend using a sim to try to learn how to determine the orientation of any plane WITHOUT having to resort to visual cues, but rather the plane's behaviour to your stick inputs.
Sims are great for this.
Fly the virtual plane out until it is just a dot in the sky... if smoke is available turn it on to help you out at first... then fly manouvers and stunts.
Then turn off the smoke and try doing the same after throwing the sticks around randomly.
This is an important skill to have... someday you'll discover that you'll have absolutely NO idea how your real RC plane is oriented.
The sim can teach you how to quickly re-establish orientation... just by observing the response to stick inputs.
I've had real RC planes flying inverted going away from me when I thought they were upright and coming towards me...
Instant terror when you realize the plane is not responding as you expect and you may loose your investment!
However a bit of calm and quick stick movements can save your sanity once you are used to this.