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You:

Compare ETH and SOL volume this week

Teeny:

ETH is still the larger market, but SOL closed more of the gap this week than in any week since June.

SOL’s share of the combined volume rose to 31%, driven by two days where it traded more than half of ETH’s total.

ETH and SOL trading volume, past 7 days

ETH$118.4B+6.2%Tuesday
SOL$53.1B+22.8%Thursday

Written by Teeny, not live data.

You:

which one moves first when BTC drops?

Teeny:

SOL, usually. Over the past month it reacted to a sharp BTC drop a median of 40 seconds before ETH and fell about 1.6 times as far.

That lead is long enough to trade: an agent could buy DOWN on ETH the moment SOL breaks.