Tablet v Nintendo DS

[Nunfa1]

Hi all, I'm new here and don't have a tablet just yet. I have 2 kids aged 5 & 7 and the oldest wants a DS, I don't know much about the DS but in my mind a tablet offers so much more. I have an Android phone and it's great, the kids can both work it just fine so I'm leaning even more towards a tablet for them. I just wondered if any of you parents out there let your kids use your tablet and whether they think it's better than a DS?

Thanks in advance for any insights and advice.