I have dived in Mexico in a drysuit (Santi Espace), but it was too hot for me at surface. I only used ski thermal underwear as undersuit. But the problems where at surface. The next time I took my 7mm semi drysuit which was ok. Last March I took a 5mm wetsuit and also that is warm enough for 3.5-4 hours for 16 days behind each other.
So this means, being warm is a personal thing. For me, even with some deco no drysuit in Mexico.
I use my Avatar drysuit in almost all conditions, including trimix dives. I only do not use the suit on the Japanese oysters in Zeeland when I am there to take pictures, as there is a chance you don't look and then the oysters are very sharp. I have done wrecks, caves and even some drycaving with the Avatar suit. Ok, for dry caving parts I used knee and elbow protection. After 3.5 years, the suit is still going strong.
The biggest problem of travelling with a neoprene drysuit would be the bulky suit. A 5mm wetsuit or the Avatar or Espace is less bulky than a crushed neoprene suit of 1 of my buddies.