Which design aspect are you better or more comfortable with?

It really depends. Floorplanning is something I struggle with but decorating is really fun for me. Especially when I already have a plan in mind. Decorating a house always starts with a rug for me. I use it to decide on the walls, flooring and furniture.

I also love landscaping. I used to hate it but now I find it relaxing. Especially painting terrain. You could have a really basic house but with good landscaping, it could change the whole house. I agree with @SimplyJen, taking elements from the surrounding area really helps make the lot look like it belongs.