It is impossible to answer this question unambiguously since each poker room has its pros and cons. Much depends on users’ individual preferences and needs, so choosing which one to sign up with is ultimately your decision.
However, in our humble opinion, Party outperforms Stars in some aspects. The brightest thing is an adequate rakeback system of up to 55%, which is a very attractive offer for today's online poker market. There aren’t many trustworthy operators with high player traffic to feature such a juicy deal. Many users complain about PokerStars in terms of cashback.