If you are not familiar with any of these alts in depth, you may read some objective analysis (with ratings):

Ripple 3.9 - https://cryptorated.com/coin-analysis/ripple-coin-analysis/
Nano 4.6 - https://cryptorated.com/coin-analysis/raiblocks-xrb/
Cardano 3.5 - https://cryptorated.com/coin-analysis/cardano-ada/
Tron 1.6 - https://cryptorated.com/coin-analysis/tron/
IOTA 4.0 - https://cryptorated.com/coin-analysis/iota/
NEO 4.3 - https://cryptorated.com/coin-analysis/neo/

If there's any other alt you'd like to be analyzed, PM or comment. DYOR before investing!