Business / VIP class seats are more spacious and comfortable. They are usually located on the upper deck of the ferry, offering a better view compared to the economy / standard class seats. Moreover, the business / VIP area is usually less crowded.
Numbered seats are similar to airplane seats, but they are much more spacious. If you choose this type of seat, you will be able to walk around more areas of the ferry, while making sure that you have a reserved seat. If you opt for a deck-lounge ticket instead, you will be able to sit wherever you like in the ferry lounge or on the deck, but you will not have a reserved seat. Kindly note that some vessels do not have a deck and the cheapest option will be the numbered seats.