Hi I have booked SENSIMAR al Dorado in Mexico booked
but also I have booked Barbados sandlas royal club level booked
the reason is I couldn't change my original one to Barbados but now I have booked Barbados I cant make my mind up what one is best for my honeymoon plz help never been to any or this kind of holiday always just kids holiday with my little girl this will be just me and my hubby both 10 days

The beaches in the Riviera Maya have been having issues with sargassum. It changes from day to day so there is no way to predict if it would even be a problem when you would go.
I would go with your Barbados reservation.

I think the sargassum problem is all over the Caribbean both Mexico and Barbados. Don't let this scare you, you'll still have a great time. I've never been to Barbados, but been to this part of Mexico many times. It's an amazing area, with wonderful beaches (the sargassum comes and goes), great food, and friendly locals. Lots to see and do close by like Mayan ruins, jungle pools (cenotes), snorkeling, etc. I'm sure Barbados is also great - you can't go wrong either way.