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There is usually a reason why gamblers often tend to take risk with free bets aside from the fact that it comes free. We know how these bets can be limited to few games, you are required to gamble on odds above 1.50 more often than not and should the bet be won, the free bet amount would not be paid along with the win.
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I think I've won half of the free bets I've received this year, and in the first half of the year I received no fewer than 10 (?) I think something like that. So of course they're difficult to win free bets, and, that's only half the process, and when you get one and don't win, it seems like you've done something wrong, but in reality it's because you don't receive many free bets, so losing FB isn't that unusual.
So, there's no real difference for me, since I usually make or look for bets at @2.5 or higher, whether they're singles or parlays, it really depends on how I feel about the match. So when I get a $xxx free bet, I have even more reason to try to make the most of what the casino allows.