DONT buy a tablet with only 8GB of memory.
This memory is for ALL the software on your tablet, as well as your photos, videos, music etc.
Considering Android (the operating system) usually takes up over 4Gb of that, once you add a few apps and a few photos you could easily find yourself running out of memory.
Until recently my son had an old Samsung S3 Mini (phone) with only 8Gb of memory and we had to replace it as he kept getting messages about it running out of memory and it could not update apps.
Get at LEAST 16GB if you can.