XRP BTC vs XRP USDT - Help us please understand the difference

٣ ديسمبر ٢٠١٧

why is the chart falling so low on XRP/BTC? Is it because BTC keeps going up?
is this the only difference? or is XRP/BTC something that should be avoided? vs. XRP/USDT (are they not the same, once you Buy Them?