Nikon d7000& canon 7d which one would be better?

I wanna to change my old camera which is canon 300d. Is there anyone can give me some advice which would be better.

Both are identical same.

D7000 has slightly edge over 7D:

Sensor of D7000 is better
More Focus Point - 39 vs 19
More storage slots - D7000 has 2 memory card holder
Longer battery life

Nikon d7000 is better. The Nikon D7000 represents an evolution of the company's venerable D90 -- the first digital SLR with movie capture capability and the first mid-range model with a high-res 3.0-inch VGA LCD panel. Externally, the Nikon D7000 is similar to its predecessor in terms of size, weight, and much of the controlled layout, but adopts a weather-sealed, magnesium alloy construction like that of the D300S.

Before changing Canon to Nikon be sure to hold one in your hands and "have a play". A friend was showing off his D5100 and I had a play with it - didn't like it at all! Controls I take for granted on my 450D just aren't there on the Nikon without going into the menus (ISO and WB).
Obviously minor stuff like this is not necessarily a deal breaker but you do need to consider it.
If you have lenses, flash etc for your Canon that will add expense to the change.

I would stick with Canon!

Tough call. I've shot them both and they are very similar. I prefer the Nikon but if you already have Canon lenses there's no sense in switching brands.