Live betting vs pre-match edge

hi all,

i've been trying to figure this out with football and tennis bets the last few weeks.

pre-match i can at least sit with the lines, compare them, and decide if i want in.
live i keep getting spots that look better, especially after a fast goal or a bad first set, but the price moves so hard that i can't tell if i'm chasing or if that's where the edge is.

i'm only playing small, like $10 to $25 a bet, so i'm not talking about huge swings.
i can grind alright either way, but live betting keeps pulling me in because it looks softer in the moment!

then after it settles, i look back and think pre-match was probably the cleaner number.

Are there more real edges in live betting than pre-match, or does it just look that way because you're watching it happen?

i'm talking about normal markets, sides and totals mostly, not weird props