Re: What era do you feel is stronger? 2004-2007 or 2008-Present?
Difficult to say, I dont know where I would place lets say Djokovic against Safin, or Murray against prime Hewitt. I think there is more potential in Murray than Hewitt, but Hewitt was more of a champion than Murray. Roddick was quite good 2004-2005 and still today can defeat Murray and Djokovic, even Nadal has his hands full with Roddick everytime I have seen them play.
We have also talented players like Davydenko and Nalbandian with their peak 2005-2007, I would say they are greater than the likes of Soderling and Berdych, we have seen both Davy and Nalbandian handle Nadal's game without any problems and Nalbandian would actually beat peak Federer more often than not indoors. I think even Ljubo showed how we underestimate the guys that played good tennis 2004-2007 when he defeated Nadal and Djokovic in Indian Wells. Gonzalez was also a quality player, better than many current routine top 10 players like lets say Verdasco. Old Agassi was also still a force to count on, he really had it in him to beat anyone not named Roger Federer on hardcourt 2003-2005, I got a feeling that 2004-2005 Agassi would beat 2010 Nadal in a USOPEN final, but that is pure speculation from my part.
The greatest talent out of the young guns (except Nadal) which is Del Potro has been stopped by injuries, I dont value much anyone in this era except Djokovic, Murray and Del Potro. Only Djokovic which is the least talented out of the 3 has lived up to his full potential, so I feel Murray is kind of the new Nalbandian (without the physical problems but with tactical problems and a too defensive gameplan) and Del Potro is a new Safin without mental problems but instead loads of injuries and physical problems. Djokovic is slightly better than Hewitt and Roddick but not by much, overall I cant say this era is more talented than the one 2004-2007.