halkidiki weather, and hotel despotiko sith. or Sani?

Hi there

new to this forum, and halkidiki! Just wondering if anyone can help me. I have seen an offer to go to Sani from 24th this month till 4th of October, and also for Hotel Despotiko near Tristinika beach in Sithonia.

I don't know which to choose - I have heard Sithonia is maybe more scenic, but don't know anything about that hotel or area.

Also, I know it is impossible to predict but do you think the weather then should be ok for sunbathing or swimming in sea? I would love to see Halkidiki but my boyfriend is panicking about the weather and pushing for Crete!

Just trying to make a decision, especially with all the Excel chaos and flights going. Thought maybe could pinch some of your knowledge!

Thanks a lot.

Lucy