We're still T5 people. When I got my newest tourney set I told everyone I can start with T25s or 100s and change the structures and the supermajority of our players were like, "Why?" So we kept it.
So I ask, why start at 5,000 when you can lopp off the ,000 and start at 5. You do that and this photo accurately depicts our set.
There is room for everything except T5000, because that is just a base T5 with extra zeros for absolutely no reason. Most players wont even say "thousand" after betting 25,000, they just say "twenty-five", so why make the readable denom smaller to fit in the extra ",000"?
I do agree with these two points. When you are talking about a degree of 1000, usually you are just taking about adding extra zeros for the fun of it.
However, T5 and T500 are not the same, nor are T1 and T100, and the reason is, you have to look at the order of the increases between common chip denominations and how that plays into stack construction.
So assume these are the common chip denominations for the sake of the discussion.
T1 - T5 - T25 - T100 - T500 - T1,000 - T5,000 - T25,000 - T100,000
Let's look at the first 4 increases in denominations for each base.
T1: 5x - 5x - 4x - 5x
T5: 5x - 4x - 5x - 2x
T25: 4x - 5x - 2x - 5x
T100: 5x - 2x - 5x - 5x
T500: 2x - 5x - 5x - 4x
Now if you continued this on to T1,000, T5,000, T25,000 bases, you will see the pattern above just repeats. However, You will notice T5 and T500 are not repeats, nor are T1 and T100, so it's not just a matter of adding zeros.
Now why does this matter? it has to do with starting stack construction. Let's assume you want to start a tournament with 1 chip - 2 chip of the smallest denomination and construct a starting stack with 200BB at that first level. We also will construct such that we have always have enough chips for 3x-4x of the next denomination in play.
T400 starting stack (base T1): 15/12/13 (40 chips)
T2000 starting stack (base T5): 15/9/12/1 (37 chips)
T10K starting stack (base T25): 12/12/5/6 (35 chips)
T40K starting stack (base T100): 15/5/11/5 (36 chips)
T200K starting stack (base T500): 6/12/12/5 (35 chips)
Observations, where you start with a 5x increase, it will be a while until your first color up and you have to put most of your chips in low denominations. Smaller credible starting stacks are certainly possible starting with Base T25.
Bottom line, your preference for tournament base has to do with where you want to put the 2x jump if you use the standard denominations listed above.
if you have T1, you probably won't even get to a spot where you introduce a chip higher than T500, so no 2x increase.
If you have T5, the 2x jump may be your third color up, which is usually beyond most home 2-table tournaments.
If you do T25, you are putting this increase in the middle and shortly after the 2nd color up (or possibly doing both color ups at once)
If you do T100, you are putting the 2x increase second (or possibly doing together with the T100 color up as the first increase)
If you do T500, you put the 2x increase right away.
Most of the argument for the T500 base, and the ones I make, is that it makes sense to do this color up right way because the most players remain, and it removes the fewest chips compared to all other bases.
As for which base is best, all can have good stacks constructed for about the same number of chips, though T1 stands out on the high side.