Hello
regarding your question if it influences everything you name more good optimization of the application
Not the same work with 1 gb ram to work with 3 gb ram,
is not the same Snapdragon 600 processor Snapdragon 820
It is not the same as run Octacore 1.7 2.5 Octacore
the more RAM, better processor, updated application and good tuneup best will run the application and therefore you will not suffer Quen paste editing, or restarts working, etc.
mobile or tablet? it all depends if you find comfortable the mobile: more pequella screen, there are phones with better specs than tablet ...