to TD's (OTB): Clocks with move counters or no?

Which is preferred, clocks with the move counter?

i.e. 2 hours in 40 moves + 30 minutes SD

Should the clock display the move number 1, 2, 3....?

Or is it preferred to not have the move number displayed?

*bump

I would also like to know this!

I have heard that using the move counter is frowned upon since it may not be the actual move number (it's the one on the score sheet). I don't really see the logic in this though, since you could argue that if somehow the time got screwed up by an accidental press and you fixed it by giving an extra clock press, then both players would have extra time since they would hit the time control a move earlier (not sure if this is against the rules but I would like to know how people handle this). Otherwise an arbitrator would have to stop the clock, and then he can edit the move number (on my clock) just as easily as he can edit the time.

My Chronos has a billion progressive time controls but all of them are pointless if you aren't supposed to use the move counter. I would like to hear from anyone with experience on this. The FIDE rules state that move counters are permissible, but it is vague on how to resolve issues like the one above. I don't have tournament experience, but I don't want to set up my clock to do something that people don't like, because it's not that important to me either way.

On a related matter, the FIDE rules are rather vague as to exactly what kind of increment/delay is to be used, but I would interpret it as NOT being Fischer increment since the language says "fixed extra time." But I get the impression that that is actually the most popular. With an increment, it is never actually fixed, you are in effect taking the unused delay from one move and putting it into another. This amounts to a "variable" extra time.

Expense aside, it would be better to just have a touch sensitive board that recorded the moves and times automatically...

Move counters are fine for a guideline but only the scoresheets can be used to determine if time control has been met.

By the way, I think the only difference on increment for most clocks is whether it adds before the move, and thus the initial time already has it, or after the move. In either case,  the full increment is added and is never variable.

Bronstein delay can be variable. It is treated like an increment but it will never add back more than the amount of delay used. For example,  with 5 seconds of Bronstein delay, if only 3 seconds are used,  only 3 get added back.  If 5 or more are used,  only 5 are added. 

Yes, I know the difference between delay and increment. I was merely reflecting on the language of the FIDE rules. Now that I think about it though, I had it backwards: With an increment you are always given the same "fixed extra time" no matter how long you take to move. With a delay, the amount of time you get depends on how much of the delay you use during that turn. So I strike my statement and reverse it.

What is the benefit of either increment or delay?  I undertand time is increased, but what are the advantages of adding time and which way makes for better play?  (As opposed to increasing the time to play at the beginning.)