需要- 1. 应该有或必须有，2.对事物的欲望或要求
1. need to have （verb), 2. needs(noun）
我们需要一支强大的医疗队伍。
我们得考虑到他人的需要。

须要- 一定要
have to
老师须要耐心地教导学生。

1） agree with ice watch;) but actually it also depends on whether u r using 讲究 as verb/noun/adjective. need full context to determine the best option.

2） agree with starlight & snowcloud:) Just to add:

需要：need to have, i.e. essential （acts as a Verb; followed by Noun; can also act as a Noun)

须要：must have (is an Auxiliary Verb before proper Verb; cannot be used as a Noun)

Also tone of 须要 is a bit stronger than 需要