Renovation - Spray foam or Batt Insulation! Advice please!

dtc said

The batts between the bottom truss chords should come out. There's no need for it and you'll need to condition the attic slightly. Leaving the old dusty stuff in a conditioned space will have the dust and crap from the old insulation in your inside air.

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Makes sense to remove it! And no issue to add spray to an older house? Built in 1949. Thinking if there is a roof leak, will it be tougher to see a leak and add moisture to it?

A lot of new shingles were added a few weeks ago. We haven’t had any issues with the roof and we are happy with him so far, but feel like he recommends spray just cause that is what he does.