For better or worse, alt coins are suffering in terms of BTC value because of the latter's extreme resilience this year. If I were to choose a new alt, I would choose one that launches AFTER the Segwit2x fork. Then it would have a good head start on Bitcoin value, priced in after the 2017 all time highs, and priced in after all the forks. It's a pity that everything else is in decline just because of something they had no control over, but that's all learning to be had from this new world of crypto trading!