For me, I carry patches and repair kit, but always two spare tubes. You just never know if the tube is going to tear around the puncture point if the tyre slips round the rim. Never used sealant, slime etc. Tried HD tubes but found the wheels difficult to balance correctly for higher road speeds and TBH they didn't seem to resist punctures any better the normal tubes.

Personally I swear by natural rubber tubes, rather than butyl. They are a little more resistant to punctures, but the main thing is they are infinitely more resistant to tearing (and pinch flats). The rubber is more flexible and elastic. The only downside is they are ever so slightly more porous, so pressures tend to need checking more often. Continental tubes are natural rubber, other brands vary and you'll need to check/ask.

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