The main characters of both of these manga have to fight against different creatures with original and cool powers. Both manga include a lot of similar humour and artwork because they are short stories created by the same mangaka. If you like one if these manga you are very likely to enjoy the other one as well. And if you like short manga with a lot of humour and some fighting then you should give these manga a try.
If you liked the fights and creatures in one of these stories you will like the other one as well. Both stories are written by the same artist. This makes the art very similar. Both stories also feature things that don't exist in our world (frankenstein monsters, alchemy). If you like these kind of stories then you should give these manga a try. The battles and powers are stunning and very exciting to see!