I would say it's better to invest 100% of your capital into BTC, but it your choice. However, tron is also a good one, I would say it has the chance of reaching ATH again.
It depends upon the amount of money you are planning to invest, since Tron is a promising project and if the amount of money to invest is low then i would suggest to invest in low valuation coin rather than in bitcoin, if the amount is big, which means above two thousand dollars then i would invest in bitcoin hands down and wait for the long haul, if the amount you are planning to invest is below $500, investing in low valuation coin for better profit is not a bad idea either.