I personally don't really understand the use of the rigid "arch" tensioners. The spring loaded ones vary tension with load, and assuming the appropriate rate spring is used and load set accordingly, it will almost eliminate the low end "lurching" that the rigid "tensioners" cause to be transmitted to the wheel.
I could see using the arch if it also had the idler on a spring loaded moment.
The grubee style (I prefer the nylon wheel one however. quieter) is the best option.
The arch's, while they work for alignment issues, are pretty horrible at what they are intended to do...... maintain a consistent chain tension.