Are UNO Show 'em No Mercy and Liar's UNO better than classic UNO?

Verified-purchase reviewers and r/unocardgame regulars consistently rate Show 'em No Mercy as the most-loved modern variant for its harsh stacking penalties and elimination at 25 cards. Liar's UNO has positive early reception but a smaller review base. Classic UNO still wins on pure familiarity and is the safer pick for very young or first-time players.