Depending on your criteria OW or Star A to A+ and Skyteam B+
I'm top tier and multi million flyer in all the 3 alliances.
Oneworld
Pros:
- Excellent lounges for Emaralds especially in HKG, LHR and acceptable in US. Food and bath in HKG, SPA service in LHR are best in class
- Good Global explorer and circle products
- Good physical products with upgrade now at AA, QF and CX complementing BA
- Well trained staff recognizing benefits in most locations during boarding and at lounges
- Current 10% discount on OW fare promotion
- Frequent Mileage promotions for F/J on select OW carriers (AA bonus on QF, CX for example).
- 3 tier FF recognition and separation of F and J class checkin and lounge benefits. Robust F product separate from J on most key carriers
- Good combination rewards from AA on OW partners. Mix and match OW partners for awards.
- One way awards on AA and BA very useful. Mix and match Y/J/F award segments in a round trip
- Good OW award availability on most non QF routes
Cons:
- Poor coverage of Africa outside BA cities
- Weaker in Continental Europe compared to Star or Skyteam
- No equivalent of Star upgrade rewards though some reciprocity between QF and BA
- Tier point based recognition on BA and QF favors J/F/Full Y pax rather than butt in seat flyers
- No online OW or partner award availability compared to Air Canada, ANA, etc in Star