It really depends on your personal set up. If you have an exchange where you can get better than coinpot rates, not doing so is a bit silly. I withdraw the ones where I have a lot referrals a few times a month and the ones where I don't about once a month.

So for example if you're in the US (or elsewhere that has Gdax/coinbase service) and have a Gdax/Coinbase account, not withdrawing to your email and exchanging there  is a bit silly as you can save network fees etc.

Withdrawing BTC frequently from faucets to a wallet is one sure way to end up paying massive transfer fees as the number of inputs on your outbound transactions are going to increase the size of your transaction, frequently to the point where you can't spend the coins as they'd cost more in fees than their total value.

If you're in an area that does not have coinbase exchange services, converting everything to bch or ltc is very likely to make sense.

I hope this helps