Tips on Marella Dream Suite Cabin versus Grand Suite

I would really appreciate some advice about which Suite room would be suitable to book as am planning a cruise on Marella Dream in April 2019 to the Canaries.

We are a family of four with two young children 5y and 3y. My 5y son has special learning needs with autism so needs a lot of space and becomes inpatient and upset if ‘enclosed’ for too long so we are wanting to book the larger rooms on the ship.

Is a Suite Cabin similar size to the Grand Suite with the only difference being the balcony? Do both room types have a bath? We would struggle with only a shower to bathe our son as he is more comfortable sitting in a bath.

Any advice would be really welcomed. Also this would be our first cruise so I am hesitant to book more expensive cruise lines which would also involve a longer fligh to get to. Many thanks.