Canon 1300D (T6) or 750D (T60i) ? I have the lens from my old nikon (70-200mm usm ii f/2,8 L) which one suits my lens better

I want the best quality out of it and the 18megapixel of t6 scares me:/ should i care about the megapixel? Not?

Yes of course

Why would the number of megapixels scare you?

Unless you are going to make a lot of prints larger than 8 X 10
or the images are going to be displayed on a large screen,
the pixel count will not matter enough to be considered.

Your Nikon lens will not fit those Canon dSLRs. Get a Nikon D3400 instead.

Maybe you should edit your question? L lenses are Canon premium lenses. If it really is a mis-named Nikon lens then get one of the 5*** series Nikon cameras.

The T6 will probably limit you as it doesn't have an articulating back LCD panel.

Either one will be equally compatible via a lens adapter. Your question is a bit confusing because you wrote that your old Nikon 70-200 f/2.8L. The 70-200 f/2.8L is not a Nikon, but rather a Canon lens. Nikon doesn't make "L" lenses, only Canon. So which is it? Is it a Nikon 70-200 f/2.8 or a Canon 70-200 f/2.8L USM ii? Either way, the Nikon will fit on any Canon DSLR via lens adapters. There won't be any difference in that regard. And if the lens is a Canon lens, the it'll work the same on any Canon DSLR.

Not sure what's so scary about 18MP. Your needs will either be met by 18MP or it won't. At 18MP, you can make a photo-quality print up to 11"x17". The 24MP files from the T6i can be printed up to 13"x20". You won't see a difference between the two files if all you're doing is uploading to the web. You will definitely see a difference if you're printing your files especially past 5"x7" size.

What most people want is high MP. But what they don't realize is that as the MP goes up, your lens and photo techniques must also rise in quality too. When you shoot at 18MP, you will get a certain amount of resolution. This will have an effect on your apparent depth of field (DOF). Since dof is what "appears" to be in focus in the shot, as the resolution of the image increases, it becomes easier to detect what is and what is not in focus. So your dof will decrease as the resolution increases.

Like dof, camera shake is basically objective - if you can't see it then it doesn't exist. As the resolution increases, it becomes easier to detect what is and what is not in focus. Thus making far easier for the untrained eye to see if the photographer screwed up by not using a tripod (camera shake) or if they got the focusing point wrong.

With higher resolution comes the need to be far more precise with your photo techniques and the lenses that you use. You will definitely have more rejected photos with the T6i than you'd get from the T6 merely because of the higher resolution making it so easy to see when you messed up.

IF you have NIKON lenses ("L" series lenses are Canon lenses… Which is it?), it behooves you to get at Nikon 5xxx series model camera, preferably a D5600 (you'll have this beauty for far more years than you can begin to imagine) with it's robust build, its ergonomics and the fact that it mimics far more expensive and sophisticated cameras. You won't regret this decision.

No, no, no! Do not try to use lenses of different brand to the camera you will buy. Even if you can find an "adaptor" you will not get good visual results from that "wrong" lens, and it will not work fully mechanically. Simply by asking the question you reveal that you will not be able to cope with the difficulties which will come from trying to use a Nikon lens on a Canon body.

So sell that lens, or buy a new Nikon DSLR.