HudBase vs Interaction for drawing text and sprites?

[LegendaryAgent]

Hey all, ive been reading about hudbases and interaction and i cant really understand what should i use and why to do simple things like:
drawing strings and vars on screen and also sprites (textures), i dont see whatswrong with interaction, i use function PostRender(Canvas Canvas), it semms its drawing every single frame, is something wrong with that? also, what is the real benefit of hudbases instead? honestly i couldnt even see the possiblity to draw strings, only vars and sprites :S

Thanks in advance!