I would say the 34l is more 'off road built' . On tarmac a 3aj drives much better, but off road I would prefer the 34L. (I still own a 34L, but sold my 3aj)
The 34L has more ground clearance (which you will like if going seriously off road!) and is easier to 'road maintain'.
The 3aj is much better on tarmac, I think, and off course an e-start. (which can fail, and if in sand or mud; how are you gonna start the bike than??)
Resume:
lots of tarmac, some off road: 3aj
Lots off road, bit of tarmac: 34L
Cheers!
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