Club: Liverpool
Case for
Liverpool may have finished below Arsenal in the league last season, but the Anfield side have shown a much greater level of ambition than the Gunners in the past couple of years when it comes to signings. Liverpool's American owners haven't been afraid to spend big money to better their team, whereas Arsenal have looked to austerity in an attempt to improve their own ranks. Walcott could potentially become one of several marquee signings for the Reds this summer, as part of Brendan Rodgers' Anfield revolution. The chance to taste glory as one of the men who brought Liverpool back to the top would be a big incentive for the Arsenal man.
Case against
The fact is that Walcott's current team were much better than Liverpool last season. Despite Brendan Rodgers' great success at Swansea, he remains an unproven manager at the highest level, and moving to Liverpool when they're in a period of transition is a risky move. At this point in time there really is no case to suggest Anfield is a better place to be than the Emirates.
http://m.talksport.co.uk/magazine/features/120708/where-next-theo-walcott-barca-united-liverpool-or-juve-arsenal-winger-176022He would fit in under Rodgers well - and was supposedly a Red as a kid.