My style is almost like using reverse psychology but on muscles. I approach with a light touch allowing the muscle relax so I can sink in deeper. This method takes some time but I would prefer to take the time and base my pressure off what I feel in the muscle and allow it to set the pace and depth (more tension = slow down and ease in). The muscle then moves me along rather than me trying to force it. With the slower pace, my sessions are generally more relaxing and with the intent of lasting structural change on a couple of extremely focused areas in a session. This approach can even be taken to a slow energetic connection allowing me to melt the connective tissue and allow the tissue to unwind as I move through it, but this is an even slower and more subtle approach that I would recommend for helping to loosen scar tissue, sprain/strain recovery, helping with headaches, and anxiety.
In regards to firmer pressure - combating the muscle with firm pressure causes it to engage in its stretch reflex which tenses up the muscle in resistance rather than relaxation. Granted, firmer pressure feels good, but this is essentially testing your pain threshold for a short term effect rather than allowing your muscle to truly release.
With that said, I don't mind using a Swedish approach with some pressure up to a certain point. If you want someone to dig into you with firmer pressure another therapist might be a better choice. (The upper back between the shoulder blades is where I am most comfortable doing my firmest pressure work.) Additionally, if a full body is what you are looking for, then I recommend a 90min or 2hr session to have more time to address everything and still have time to have some meaningful effect for main areas of concern.