Here's the list:

French
German
Spanish
Italian
Portuguese
Romanian
Hungarian
Czech language
Polish
Danish
Dutch
Greek
Swedish
Finnish

In descending order, Can you arrange them in terms of usefulness?

I am tired of Romance languages, and I am just learning a language to have fun and just to speak 2 languages or more. Will Eastern European languages be easy to learn?

Examples:

Polish
Slovak
Slovene
Czech
Hungarian
Russian
Serbian
etc...

What is "hello" in Hungarian and in Polish?

Is it true that in Hungarian you use the same word for "hello" and "goodbye"? Write me the pronounciation as well, please. Or any extras.

Like what I said. I know Hungarian has a lot of cases but they are all agglutinative whereas Polish changes some of the word in order to figure out the case. Could someone who has tried to learn both please give me a good explanation on which is easier?