Out of interest where did you get this info from?
Very good question and I can only reply that this is my personal experience from using it and from what I've picked up in conversation from the Defence staff who are involved in the procurement of the hexamine replacement - the main criteria being that the replacement must be as effective as hexamine (which is stable in storage and burns hot).
I have used the various gels available in the past and have been very unimpressed, that said, restaurant chafing gel is cheap and available and should not be overlooked if it works for someone.
I can only recommend that you try the Fire Dragon fuel, but I've found that the cheapest way is to buy in bulk (pack of 6 blocks x 10 packs for £26). If you want, PM your address to me and I will send a couple of blocks if you want to trial and post your finding here, may be useful to really see if there is a difference.
I certainly noticed a difference when compared to other gel fuels and the Zip fuel blocks; and I would buy Fire Dragon gel in preference to the blocks so that 'portion control' is easier.
I found Fire Dragon to be almost as fast as a broken-up hexi block - a broken hexi block will burn faster and hotter than an unbroken block. Probably around 5 mins for 500ml water, not very scientific I know

The Trangia fuel I prefer is this one http://www.gooutdoors.co.uk/fuel4-5l-bio-ethanol-spirit-p284704 and I prefer it to meths.
Really hoping that one of the stovies takes over now, as I really don't have a clue exactly what I'm talking about regarding stoves or fuel types! (only my personal experiences and preferences)