Is it worthto have psm1 and pspo1 both

Definitely good to have both, it means you have demonstrated proficiency in both knowledge areas.  Also means you are pretty serious about your Scrum knowledge.

Even if one has CSM they still need to have these.?

From a "resume" perspective (and a knowledge perspective), always better to have more certs than less. (and preferably higher level certs like PSM II, etc)

I would recommend to have both of them. It's always better to get more knowledge to become professional.

Whenever people ask me for advice, I always ask if they like collecting stuff. Are you after a large number of certifications under your belt, or are you looking to become a better version of yourself?

Are you looking to advance your knowledge, and therefore, practice in helping teams work in Scrum (and you are a coach or SM)? Then I'd suggest you stick to PSM II.

In my view, PSPO I may not really bring worthy benefits, unless, of course, you are a product owner.

I agree with @Eugene about his stance on collecting.  Having the certifications does not actually mean you know, understand and can act in an Agile/Scrum manner.  I know a number of people with CSMs, CSPOs and even PSM I that were able to sit through the class (CSPO), sit through class and take test covered in class (CSM) or have the ability to study and pass the PSM I (usually people fresh from college).  But that does not mean that I would hire them as a SM or PO.  The certs look good on the resume if you also have some experience to support the use of them.  Having the certs with no experience just shows that you are really good at studying and passing tests. 

So, depending on your motivation for acquiring the certs, you will have to decide if having them in different disciplines is worth doing. Yes, I have a CSM, PSM I, PSM II, PSPO and SPS but I did them after I had worked in the Scrum environments and did it because I wanted to show my dedication and appreciation of Scrum.

Nice information