Your name Olivia suggests you may be a woman. Either way, if you are married then your partner needs to be happy as well about moving to an unknown part of the country. This does have certain variables, when as a foreigner, an expat community will likely be smaller.
Regarding Surat Thani City, I have lived there for more than a year but 7 years ago. Its true, there isnt much in the city to get excited about.
An "opportunity" is not a commitment so unless the job has significance enough to justify it, I wouldn't choose that place.
Being so much further south of most other places in Thailand, it remains hot enough throughout the "winter" to require the Aircon on all night.
On balance the best suggestion I can make is that you go there and investigate matters that are important to you.