Would you tell me if there is a difference in meaning between I choose and I'll choose when making a decision in the process of speaking? For example:
Person A: We have two tablets of that brand. One with 3GB of RAM and one with 4GB of RAM.
Person B: I choose/I will choose the one with 4GB of RAM.
What English grammar books say is that the future simple can be used when someone makes an instantanous decision. But, I've also hear native speakers use the present simple in that sense, as in my example. Is there any difference between the two in the context? Are both natural? If so, do native speakers of English sense any difference between the two?