Actually it would not be better in all cases, just different.
CLW heals without a surge, but only for the target's surge value.
Life transference heals without surges AND it heals according to your surge value.
In a situation where one of your allies runs out of surges, life transference is better if you have couple of surges left. You can boost your ally up to half of his hp's with one power, and if your surge value is higher, they'll get extra benefits.
Actually, life transference is a really nice utility swap for defenders MC'ing into cleric, as their surge value is high, and they are likely able to take a hit when healing their allies.
CLW heals without a surge, but only for the target's surge value.
Life transference heals without surges AND it heals according to your surge value.
In a situation where one of your allies runs out of surges, life transference is better if you have couple of surges left. You can boost your ally up to half of his hp's with one power, and if your surge value is higher, they'll get extra benefits.
Actually, life transference is a really nice utility swap for defenders MC'ing into cleric, as their surge value is high, and they are likely able to take a hit when healing their allies.