If it were me, I would start conservative and use 278 or an average of the two since you are newer to structured training AND are tackling SSB mid which sounds like it will be an increase in volume for you. If you find the workouts are a little too easy then ramp up your FTP incrementally until your at the 301. FWIW I’ve found out the hard way that one should choose the lower volume plan if not sure which one to use, you can always add in extra workouts as needed. Coach Chad, on certain podcasts, discussed this as well and I think the overall theme is to start conservative and ratchet it up as needed.
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