"I think that ..." v.s. "From my viewpoint/perspective"? [closed]

Solution 1:

They are the same. You can use whichever one you would like.

"Perspective" is:

A particular attitude toward or way of regarding something; a point of view. [Lexico]

I will define "thought" instead of "think" so both definitions are for nouns. A "thought" is:

An idea or opinion produced by thinking, or occurring suddenly in the mind. [Lexico]

These are obviously very similar. Both options ("from my perspective" and "I think that") are grammatical, but "I think that" is much more prevalent [Ngram].

Note: I included "I believe that" in the Ngram because it is another applicable phrase (in case if you want an extra one).