The "will" / "going to" issue is notoriously fraught with difficulties. Both are possible in your sentence, with little difference in meaning that I discern. slocawber According to grammar one of the uses of WILL seems to be talking about future facts that do not depend on one's will or intention.
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slocawberAccording to grammar one of the uses of WILL seems to be talking about future facts that do not depend on one's will or intention.One of the uses, yes, but an obvious exception is first-person use
slocawberhe example you gave for GOING TO with no will or intention is in my book referred to as 'logical deduction' (e.g. 'Look at those black clouds. It's going to rain soon.')I prefer to think of BE going to as being used when there is present evidence of a future situation.
fivejedjonI prefer to think of BE going to as being used when there is present evidence of a future situation.And can also express will/intention in the first person, e.g. "I'm going to resign".
GPYAnd can also express will/intention in the first person, e.g. "I'm going to resign".Yes, but that is covered by 'present evidence', the present evidence in that case being the speaker's intention.
fivejedjonYes, but that is covered by 'present evidence', the present evidence in that case being the speaker's intention.But then by the same token, isn't "I will resign" also demonstrating present evidence?