Mulching

Adding Mulch
If I add mulch to my garden, should I assist it and dig it in as it rots down or leave it alone to mix in on its own? For e.g Pea straw.

Mulch
How do I decide which plants or trees would prefer bark or something like Mulch & Grow? For example, a lemon tree or roses in the garden and tomato or cucumber plants in pots.