As someone who has attempted learning both Slovak and Czech and went for Slovak in the end, I can assure you that Slovak is definitely the way to go if grammar frightens you or isn't too easy for you. read more
The Slovak language is a little bit easier at basic and intrmediate level (fewer case suffixes) however it turns into a more difficult language at advanced and advanced plus level (many grammatical rules that the Czech language doesn’t have at all). read more