Turf tires suck for traction, but it depends on what you are doing. I bought my tractor with turfs and used it for finish mowing, worked great. If you are doing a lot of mowing (finish or rough cutting) and most of your tractor uses are pto intensive, they are probably ok. If you are doing ground engaging where you need a lot of pulling force (instead of just power) then get industrials. Snow removal also sucks with turfs, but I imagine it does with just about anything without chains. Turfs (mine anyway) are generally wider and quite stable, though load capacity is usually less.
Now that I have a different mower and won't be using the tractor anymore for finish mowing, I am putting together a set of ags for the rear and probably industrials for the front- mine is 2wd and I want the load carrying from the r4's in the front since my uses are changing directions and am planning on doing more ground work. I will probably also get a set of chains for the turfs to use in the winter for snow removal and leave the r4s on the front all of the time.