Well Wembley Arena is near Wembley Park tube station, so King's Cross is probably easier in that respect as both stations are on the Metropolitan Line. It shouldn't make a huge lot of difference though, they're both a similar distance from Wembley and from Victoria you only need to make 1 tube change (Victoria Line to Jubilee Line at Green Park).
Paul
'06 - London, Dublin, Reading
'07 - Katowice, Wembley, Dusseldorf, Copenhagen, Nijmegen
'09 - London, Manchester, London
'12 - Manchester, Manchester, Berlin, Stockholm, Copenhagen
Comments
'06 - London, Dublin, Reading
'07 - Katowice, Wembley, Dusseldorf, Copenhagen, Nijmegen
'09 - London, Manchester, London
'12 - Manchester, Manchester, Berlin, Stockholm, Copenhagen