In addition to all the standard drawing tools that Inkscape offers (those that add and edit primitives, such as lines, curves and geometric shapes), it offers a high degree of control of the parameters. For example, if you add a dotted line, you can get quite specific about whether or not the dots have rounded ends and how you want them to be spaced. Every tool goes into exacting detail like this. Generally, as soon as you click on an object to edit it, you are offered a multitude of options. It also has other utility-type tools that are often useful to artists, such as bitmap tracing and facilities to combine or simplify objects. As with all the programs, if using it for drawing, you might have to look things up the first time you do something.
Krita is primarily known as a bitmap painting program for artists, but it has a full set of vector drawing facilities. To begin working with vectors rather than pixels, you only have to create a vector layer and switch to it. Inkscape has more facilities as a vector drawing program, but they are often hidden behind a complex and inconsistent user interface. In addition, if there is a gap in the vector drawing facilities of Krita, there’s always a chance that you can accomplish an effect with the bitmap tools.