Hi Jim,
From my pov, the trouble withPoole is how far you have to go !!
You could try the Swash [if not too busy!!], Old Harry [if not too bumpy] or the Patches [if you want to lose tackle in the rocks!]
Go out of Christchurch and the Ledge is just round the corner.... anchor in front of it [if fishing the flood] ... or drift over it. Huge area.......lots of fish holding \ catching potential.
Beware of shallow areas around LW ... and wind over water when the tide is running!!
.......and all the pot gear \ ropes in the water.
Have fun!!
Alun.