I need to go

どちらの何の言葉がはよりもっと良いですか。
１。行かなければならない
２。行く必要がある

I need to go( but I do not want to go)

use 行かなければならない(must)

I need to go(both. I want to go or I do not want to go)

you can use 行く必要がある

Thank you for your comments. Understood many things.... Its notebook, so will write here.....

When i said [良い] i think to speak it like [ii]. Is it right? In case of [より良い] seems it must be [yori_yoi]?

How to identify text in such cases - how to read words than have 2 or more sounds? And - about yori - is it only one word [yori_yoi] (better) that starting from yori(exist any others words starting from yori)?

Next thing.... From my learning i remembered next following....

For example -

small - smaller-smallest - 小さい  -   もっと小さい  -  とても小さい

Should i change in every same form もっと小さい(smaller) - to - より小さい(smaller)?