Reliable Heart rate sensors.

As the title suggests I'm after a heart rate chest sensor that links with strava on android Bluetooth connection that's reliable. I'm not interested in Garmin as I have had nothing but grief with these. Looking at cheaper one they seem to have very mixed reveiws and poor reliability. Looking for something better than the fitbit charge 3 link I normally use. Not looking to spend stupid money either. Any suggestions, it's for biking and running.
Too many bikes according to Mrs O.
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2020 Voodoo Marasa
2017 Cube Attain GTC Pro Disc 2016
2016 Voodoo Wazoo
Marin Palisades Trail 91 and 06
Scott CR1 SL 12
Cannondale Synapse Adventure 15 & 16 Di2
Scott Foil 18
I always have to use Gel and wash the strap after every ride or a thing film of salt stops it working.
I also have a LBB which means wearing it on the side of my chest or it won't get a signal. LBB happens at higher heart rates - probably damaged my heart riding too much in the past.
Maybe a quality optical sensor is a good idea?
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