i put, trangia, purely because it's bomb proof, i've heard of these being dropped down cliffs, bent back and used minutes later, gas would be more exciting!
as for the lid getting stuck, this happened to me once very embarrasing, try lubing the threads with vasaline, also have a rubber band handy it helps you get a grip of the lid with gloves on or cold hands( i use a bit of bike innertube).
meths also has other aplications such as cleaning fluid, a fire lighter/starter, and also to harden skin(though i don't do this).
mine has flared up1ft high fireball (twice now) and i still haven't figured out why, (no rain, or other possible cause)otherwise i would say safe to use in a tent dorway. i have spilt burning meths before in a tent,(my scout leader told me to refill the trangia but gave me no instructions, so i literally poured more in whilst alight, (i coulden't see the flame) for this reason i would say it is a potential fire risk compared to refilling gas or petrol stoves, when meths burns you can't see the flame in daylight which is asking this to happen.
if i was doing a long haul trip i would use my MSR whisperlite international 600, purley because it's reliable, hot, and you can get petrol everywhere, meths and gas are not so easy to find, oh and you can also run my MSR on diesel meths, aviation fuel, white gas, vodka(any alcohol!), pretty much anything that will burn and i have heard of people welding plastic canoes with them! petrol also doubles as obviously a vehicle fuel so one can be siphened to the other where needed.
hexamine: i used to swear by but it's expensive, dirty and not so hot or controlablein comparison.
fire gel: seems more of a gimmick.
gas IMHO is more of a one hit wonder:
possitive, it's easy to use, light, compact ect.
neggatives, difficult to get hold of and the right size, it is far more dangerous to carry and store.
the cookers they fit to (apart from hose versions) tend to be top heavy.
gas can be difficult to light in cold conditions. (as can meths).