When i'm expecting to be riding on dry earthy/sandy ,
but not too rocky trails , paved and gravel roads:
I have been very pleased with the Schwalbe Table Top 2,25 tires (wire bead) , front and rear.
Was uneasy at first due to the thin sidewalls and lack of snakeskin or DD protection ... ,
but so far no flats
For all other riding - Schwalbe Nobby Nic DD 2,25 folding - front and rear have served me well.
For reference : My rims are 24,5 mm wide - and allow riding with as little as 1,6 Bar pressure (nobby nic).
Since i ride a hardtail - the x-tra width in tire cushions my rear nicely.
2,25 were the widest i could fit at the rear .