Neither of your sentences is idiomatic.
Your first sentence comparing two brands of phones should read:
LG phones are better than Samsung ones.
However, if you were comparing different features of those phones, you might write:
With respect to camera quality, LG phones are better than Samsung ones.
Synonyms for with respect to are:
with reference to, in relation to, apropos of, with regard to
So they generally refer to a particular aspect of something, or are used to digress from the theme previously being discussed.
Your second sentence should read:
Nepal is preferred ......because it offers better value for money.
Way more things is slang, and
Way more things with respect to the price that they offer for it is both clumsy and unclear.
However, you might write:
With respect to price (value for money), Nepal is preferred to any other south Asian country.....