I'm wondering whether it's better to see a physio or a chiro for back problems when pg.

I've got a past history of back problems and now that I am getting bigger it's all flaring up again.

Bit of History:
I've got really tight Gluteus muscles (my butt basically) and not tight in a good way that i could bounce a coin off it I can feel the muscles pulling and tightening as I walk.
I have problems with my pelvis, one hip is rigid and the other hip is super movable, sometimes I can feel it moving up or down.
I also have issues in the sacroiliac joint (lower back) which is causing me some pain and other related muscle issues due to compensating for the sore back.

I've seen a physio before, for about 18mths and that did help, but I am wondering if a chiro would be better?