I have both machines, and both the racer 2 and the relic are very similar.
On the other hand they are also different.
Racer 2 allows full view and quick change of settings by having screen up front but doesn't bother me too much either way.
Relic is a bit more of my deep seeking machine. It does have more stability at higher sensitivity and depth levels. It also have the Swift mode which allows for denser trash areas to be even faster on recovery time then it already is, which was hard to believe. I have the 2 coils it came with calling with the 5.5x10 DD also. Favorite being the 5.5x10 for all around. Coverage of the stock large coil almost, but separation of the small 5" almost.
As for the racer, it's also an incredible machine. Depending on soil can be almost as deep as the relic and definitely a deep machine compared to others. I have the same coils for it that I do for the relic and the 5.5x10 is again my favorite for all around but each have their place. In my arsenal having both, I use mine in more of a general hunting and coin and jewelry hunting manner. This is in part because I also own the relic. If I didn't, the racer 2 or the relic can be used for any style of hunting and it will excel.
The iron area of the VID is a bit different between them. Also the racer 2 allows for adjustment of both high and low tone break- areas on 3 tone as well as allowing you to change the actual frequencies of the audio which is nifty, but not necessary.
So each have some differences but both are great.
In conclusion you really can't go wrong with either and both feel similar in weight because of the way the relic is balanced and in some instances the relic can even feel light when both have the 7x11 at times.
I did have the relic first. And you can't go wrong with either.