Why not get both? I have a PF80 and an XW20, expensive. I also have a 15mm BST starguider.
Only £49, not the widest fov, but pin sharp and at £49, highly recommended.
Again thank you all for your posts👍
As well as buying the Pentax xw 20
I also sent off for one of the 15mm bst starguider and am amazed at the quality view through this eye piece for its price