I am in Block 56 so will probably be a bit biased.
The higher numbered blocks are nearer the entrance and therefore nearer the security guards, the supermarket, bar, restaurant and clubhouse. The lower number blocks have less apartments per pool but also smaller gardens.
I don't think there is much to choose between them to be honest, security is good all round the resort, you can use any pool you like and the difference in distance to the pub is only 1.2km from Block 9 compared to 350m from Block 59.
More important is where your block is and how much sunlight you get. Some terraces get early morning sun and shade in the evening and others the opposite. There are some which are pretty shady all day so watch out for them. Ours is South West facing so we don't get the direct sun until mid morning but see a fabulous sunset every night.
The Phase 1 Map
should give you a view of distance to the commercial centre. Add around 100m for the length of every horseshoe and 100m between them as a rough guide. The map also has block numbers and orientation so you should be able to figure out which terraces will get morning sun, which will get evening sun and which are in the shade of neighbouring apartment blocks. SunCalc
is a fantastic tool that you can use to see the sun's position on any date and time. (Thanks Dave Perry)
Have a good visit and good luck with your search.