Help me decide please?

Not that I will be basing my decision entirely on the opinions of "strangers" but it is helpful to have some feedback from others with no direct investment on my decision (like my family does).

I have been lucky to receive 2 offers in a specialty area that I've always wanted to work in.

Job 1:

-Full-time night position,

-job includes base pay + night differential

-Commute is 30 minutes.

-Orientation is 3 months.

-I've already technically accepted and begun the physical, fingerprinting process, since this offer arrived first, and I did not think I would be offered Job 2.

-I prefer to work nights, over days generally, but who knows if that would change in a new specialty?

Job 2:

-Part-time day position

-Base pay is $2more, but since it doesn't include differential, it works out to exactly the same amount.

-Commute is 40min.

-Orientation is 5months.

-Day shift requires me to find extra childcare for after school.

-I have a prior working relationship with the manager of this job, and I feel I may burn a bridge if I turn down a job I've been asking about for 2yrs.

I don't technically need the extra hours that full time offers, because I have 2 per diem jobs, to make it up. But of course guaranteed hours is better than potential.

Thoughts? I am leaning toward #1, but the longer orientation for #2 is really stalling my decision! And technically would pay more if I were ever to get a night position, but that is not guaranteed to happen. Do you all think that 3 months for a specialty is okay for a not new grad?