It looks like I would want ADSB In along with the Out.
It seems that there is an advantage to having in for weather, Notams and other information.
So it would be nice to have In working along with the tailBeacon. I might have to have In on my phone if I can't get Stratux and tailBeacon to work together.
Garmin, Stratus (Appareo), and other are complimenting In with their Out.
From https://www.faa.gov/nextgen/programs/adsb/faq/#x1
What is the difference between ADS-B Out and ADS-B In?
ADS-B Out refers to an aircraft broadcasting its position and other information. ADS-B In refers to an aircraft receiving the broadcasts and messages from the ground network such as TIS-B and FIS-B. ADS-B In is not mandated by the ADS-B Out rule. If an operator chooses to voluntarily equip an aircraft with ADS-B In avionics, a compatible display is also necessary to see the information. Refer to AC 20-165B for information on ADS-B OUT and AC 20-172B on ADS-B IN installation and certification.
What are FAA ADS-B In broadcast services?
ADS-B In pilot cockpit advisory services consist of Flight Information Service-Broadcast (FIS-B) and Traffic Information Service-Broadcast (TIS-B). These are free services transmitted automatically to aircraft equipped to receive ADS-B In.
FIS-B provides a broad range of textual/graphical weather products and other flight information to the general aviation community. FIS-B is only available on the 978MHz Universal Access Transceiver (UAT) equipment. FIS-B includes the following:
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Aviation Routine Weather Reports (METARs)
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Non-Routine Aviation Weather Reports (SPECIs)
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Terminal Area Forecasts (TAFs) and their amendments
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NEXRAD (regional and CONUS) precipitation maps
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Notice to Airmen (NOTAM) Distant and Flight Data Center
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Airmen's Meteorological Conditions (AIRMET)
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Significant Meteorological Conditions (SIGMET) and Convective SIGMET
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Status of Special Use Airspace (SUA)
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Temporary Flight Restrictions (TFRs)
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Winds and Temperatures Aloft
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Pilot Reports (PIREPS)
TIS-B is an advisory-only service available to both 1090ES and UAT equipment users. TIS-B increases pilots' situational awareness by providing traffic information on all transponder-based aircraft within the vicinity of the ADS-B In equipped aircraft receiving the data.