Samsung tab 4 or should I wait and buy the samsung s?

Tab 4 seems rather mediocre in comparison to tab s. In the past i've owned Lenovo think pad but the Wi-Fi keeps cutting out. And it occasionally switches itsself off.

I'd rather go for Samsung Galaxy Tab A. Nice vertical design. Over 14 hours battery life. And it's Lollipop OS. Seems like a better and newer choice over Tab 4. Samsung tab 4 or should I wait and buy the samsung s

The screen resolution is very poor on The tab A though isn't it?