Below are my opinions and not statements:
Tohatsu are noisy smelly, old fashioned, look cheap and worth diddly squat second hand.
But they are fantastically reliable and one of the mainstay engines in the third world where service and parts can be hard to come by.
They are warrantied for racing, hence zap cat and thunder cat racers the world over tend to use them.
If you want a motor that holds no chic, but will plough on through almost anything regardless then this is a very good choice.
Etec has the trendy name and marketing behind it and the 300 hours are tempting (but very carefully read the small print), but (IMHO Gordon, Paul et al) still noisy and smelly. More and more outboard service centres are uncomfortable working on them as more little nuances come to light.
But, in good order, they are torquie and pretty reliable with, obviously, very cheap maintenance. They are likely to be far more economical than the Tohatsu (still less than a 4s though).
Due to the marketing, they will have a far better resale value.
If I had to buy one?
Assuming I planned to keep it a while and didn't plan to put it on a trendy pilot house, it would be the Tohatsu without a doubt.
If I had any choice I'd save a little more and get a Jap based 4 stroke.