Honestly, this debate is kinda silly. Pretty much all the Trek films (minus ST5 for reasons that were outside that film's control) had fantastic visuals for the time they were made. Look at Star Trek VI. The opening Praxis destruction was fantastic for 1991 (it was even nominated for an Oscar, I believe, but lost to T2). Today, the effect is a "meh...it's okay".
Clearly, the visual effects for STXI are the best given the latest technology was used to create the crisp, clear visuals. If one is wanting to debate the process of how those visuals were made, well, frankly, that is a completely different debate altogether.
If you look at how ground-breaking the VFX were/are for their time, then Star Trek 2009 would lose against every movie except TFF I think.