Touch probing vs Scan probing

Well, they are quite different. Kind of a broad subject actually. 
It would greatly depend on what kind of parts you have to measure and what kind of data you need.
I am just starting to get into scanning now, so far things to note would be that calibration takes significantly longer. Your probes will take much more wear. Small details and the cleanliness of your part matter a good deal more. Scanning features like bores are generally faster than taking an acceptable number of TTP points.   

I'm sure someone else will chime in, but it really comes down to how your going to use it.  

There is several small and major differences between the two. I believe the analog heads are superior in almost every way, especially for doing basic touch probing:

Your prehit and retract can now be as small as .025 and maintain consistent and accurate data (for TTP minimum recommended is .06)

You can take a hit by travelling in the Z+ direction

Incorporating multiple tips in a routing is easier and faster, as well as incorporating a probe tip changer.

Hits taken when probing are slightly more accurate than a typical TP20, because instead of taking a hit when the probe makes contact with the part, the probe hits the part, reaches its upper force limit, and then records a few hits while pulling away from the part surface, recording the best one.

Analog probes are not sensitive to magnetism. TP20 modules can easily be rendered useless by a powerful magnet.

In terms of actually scanning, I recommend you use it only when you deem it necessary.

It's super helpful when reporting a the profile of a line or surface, as well as the shape of a hole or generally finding error in the shape of anything.

However: It will wear tips more aggressively than traditional touch probing. Scanning aluminum with a ruby tip is NOT recommended as it will rapidly degrade the ruby tip. If you are scanning aluminum use a silicon nitride tip.

edit: spelling

Thanks, I'll keep it in mind.

Thanks, I appreciate your time and comments. 

Great summary

We only have Analog Probes here and I would always recommend them over TouchTrigger Probes.
But one thing to keep in mind is that TouchTrigger Probes take singular hits (not scanning) a lot faster than Analog Probes.

Yes, although there is a "fast probing" option that can be toggled on for analog probes that makes them the same speed. It just sacrifices the accuracy you gain by taking hits the same way a touch trigger probe would.

Scanning sensors WILL wear out and/get damaged when crashed, just like TTP sensors.  The biggest difference for long term consideration, is COST. 

A TTP TP20 or a TP200 sensor is <$1100 to RBE. 

An analog scanning HP-S-X1H is 10x more expensive @ $10k. ($15,444 with a $5560 core as of April2022).

instead of digging hole with hands you will have some shovel for this, scan is mostly faster 

Scan is something like must be at present day, instead of collecting 500 points you can have it in one feature much faster and easier. I think every one should use it :) 

Scan speeds will be important for you if you have some small tolerances also the filtering methods will take great effect on small tolerances. 

for example while i had 0.05 mm tolerance of roundness

result of 36 probed points was 0.017 

result of 1200 points of scan was 0.08 

result of filtered scan could be changed by filtering for up to 0.03 

and its quite hard to learn do use filters and what filters for part speed and points quantity