I have only owned my TC for a few months and haven't tried it for fencing yet. I have S300 with vertical lift and the it is great for digging most holes. My biggest complaint with S300 is the light front end weight. I can't climb any reasonable grade without fear of tipping back. The auger and bit are just too light to hold the front down. Often I have to back up a slope/hill. Sometimes going forward is the only option depending on terrain. Also if digging a hole while facing uphill with the SS, the lack of weight on the front won't allow it to dig with down pressure.
The TC should not have any of these issues. The only negative with the TC, is having to move forward as the hole is dug to maintain vertical digging. I suppose one has to move backwards as it is raised also. Like most jobs, with a little practice, one will learn just how much and when to move. TC will be much easier getting in and out compared to a SS. I have the TC 5610 and plan to run my hydraulic tamper off the rear hydraulics. I changed one of the set of rear hydraulic switches to run continiously vs the momentary switch which is standard.