Depends on your usage.
Casual Users:
For casual users trying to aim their Dish Network or DirecTV, the analog
SF95 is a handy tool. For aligning T5 or other FSS satellites, the SF95 will not be very easy to use since the nearby signals from DSS satellites is much stronger and will influence the meter. For example next to T5 (97W) to the west is DirecTV (101W). The meter will keep dragging you to the 101 satellite while you are thinking that T5 is coming strong. So, I would advice you to use the TV and Signal/Quality strength bars you see on the screen in conjunction with the SF95.
Casual Installer:
SF95 is not a tool to use. The Accutrac22Pro (or Digisat Pro) are first entry. It is more sensitive than the SF95 and gives you the chance to hookup two LNBFs simultaneously to the same signal meter. Useful for aligning up legacy Dish Network Dish500 dishes and DirecTV.
Professional Residential Installer:
Definitely the BIRDOG or Channel Master 1009IDF are the way to go. These meters are self powered and will give you the Signal strength, Signal Quality, and satellite ID on one screen. No more waste of time on trying to align a dish. Usually it takes 1-3 minutes to lock on the satellite and 2-3 minutes to peak the signal. Works with DSS and all the FSS satellites.
Professional Commercial Installer:
BIRDOG or Channel Master 1009IDF as a starting point. A spectrum analyzer is also recommended.
If you have any specific questions, please don't hesitate to ask.