Are there any factors that contribute to how fast a transaction is confirmed other than the Fee (sat/B), and a little bit of luck?
Does it matter what service is used?
How large the transaction is?
How many senders/receivers?
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Which transactions make it into a block are purely at the discretion of the miner who mines that block. In general, they take the transactions that will yield them the most in fees...but there's not really a way of saying for sure. If a particular mining pool has another incentive in play that is worth more to them than the fees they'd be sacrificing, I'm sure they would operate differently.