For Bitcoin we have the following information about the propagation time from here:
12.6 seconds is the time it takes for a new block to propagate to 95% of nodes.
Is there any observation on how much time it takes for a transaction to propagate through the IOTA network?
If there is no statistical information, then, can we say that the propagation time must be less than bitcoin because of:
1- IOTA transactions/bundles are smaller than bitcoin blocks.
2- Each IOTA node broadcast the transaction as soon as receiving it, without sending INV and GetData messages as Bitcoin.