Grand Theft Auto IV - 360 outselling PS3 in UK

Early indications are that the Xbox 360 version of GTA IV is outselling the PS3 in the UK. ELSPA are reporting that 335,000 copies were sold on day one for the Xbox, compared to 274,000 for the PS3. Good news for Microsoft then, although considering the installed bases and the fact that the previous largest day one seller on PS3 was GT5: Prologue - approx 80k - you can spin this as decent news for Sony too. And obviously long term sales are what ultimately matters. What isn't in doubt is GTA IV's sales record. Its combined day one sale of 609,000 has easily beaten the previous record holder - GTA: San Andreas (PS2) - which sold 501,000 on the 29th Oct 2004. And just in case you're wondering what the fuss is all about my GTA IV review is here. I played it on the 360 rather than PS3 - primarily due to review code but achievements and future downloadable content played a part - but anyone here playing on both formats? If so, notice any real differences?