Travelling from Athens to Naxos. Ferry related questions.

Hello everyone.

We are travelling from Athens to Naxos and Paros mid mid-May. I have a few doubts about the ferries.

1. Which one is better, Seajets or Bluestar? I read a few posts and comments that said there might be sea sickness in smaller and faster boats, which are Seajets. Should I go for Bluestar Delos?

2. Should we carry our food, as I have read that food is bad and expensive?

3. Is selecting a Deck lounge okay? Will our luggage be with us during the entire journey?

4. How frequent are the cancellations, and do you get a refund if it is cancelled?

5. Are there usable toilets for people who have booked the deck lounge?

6. Which website is okay to book the ferries? Some of you said that official websites are slightly on the expensive side.