from a financial point of view, dioxycycline is the cheapest. I am off back to borneo in 14 days time for between 6 months and a year so i have just been given 395 tablets by the nhs for less than £20.... pretty damn good value for money if you ask me!
i have not gone down the mefloquine route because quite simply i am very prone to dreams as it is and dont really want to have nightmares whilst being isolated in the middle of the jungle! if i woke up in the middle of the night in my hammock and panicked it wouldnt be a very pleasant experience.
However it should be noted that taking dioxy at the wrong time of day can also be a nuisance. The majority of patients (including myself) find that they become more photosensitive than usual: i.e: if you took it at midday, even with factor 50 suncream, you will get sunburn. The other thing they advise you not to do is take it when you lie down as it can promote excess stomach acid. Why people fall foul of either of these is beyond me. if you take it at dinner time, there will probably be no sun or little sun and i doubt you would be lying down... so really, if you do get sunburnt then its your own fault!
one final advantage of dioxy, again reverting to price per unit, is that BOTH tablets can be used in the TREATMENT of mild to mild/acute malaria in the correct dosage. Now whilst this seems fairly useless if you are taking them as a preventative, i regularly come across unfortunate souls who are in extreme pain due to malaria, and if i have a huge box of tablets costing pence each, you can be sure that they will get enough to help ease the symptoms. now because i go for the cheaper option, i not only have masses of the damn things, but i didnt really pay a lot for them so i am more than happy to spread them around a bit.
you should also check closely in regards to actually taking the medication, for example, dioxy needs to be taken for one month AFTER leaving the malaria zone and there are cases of people having died because they didnt follow this procedure and subsequently contracted malaria several weeks after leaving, they obviously thought it was just flu etc and didnt get it treated.
so things to consider,
side effects
cost
number of tablets required for duration AND the grace period either before or after! (i think meflo needs to be taken two to three weeks before depature)
can the drug TREAT malaria... just in case....
ive rambled on for long enough now but i hope that in amongst all that gibberish that you find at least something useful....