i actually did the math a while back and the results are very varying. i did all of this assuming dps is constant (which is not) but it shouldnt matter too much honestly
first i got the effectiveness of each rr effect compared to the effectiveness of a single balance
extended = (60+25)/30 = 2.833 times more effective than a balance
enhanced = 1.5*(30+25/30) = 2.75 times more effective
extended is always better than enhanced if it lasts for the full duration of 85 seconds.
expanded depends on party dps so it should be something like... this 2*0.5 + h/d * 0.5 + t/d * 0.5 = 1+(h+t)/2d
where h is healer dps, d is dps...dps. and t is tank dps
if we want to know the breaking point for when extended is the same as enhanced we gotta do
1.2*time= 1.3*55 + (time-55)
you evaluate the equation and get 82.5 seconds
its all dependent on party dps so lets just assume everyone is good at what they do.
usually (good) healers do about 1300 dps right now, and tanks like 1800 i think? dont quote me on that. decent dps do like 2100 dps afaik
now we see what the party's damage would be after 85 seconds in every scenario and assuming both dps do about the same damage (D will be one dps and d will be the other one)
no buffs
85 * (D + d + h + t) = 85 * ( 2100 + 2100 + 1300 + 1800) = 620500 damage
for extended
85 * (2.833 * 1.2 * D + d + h + t) = 1048828.6 damage
enhanced (lasts 30 seconds less, mind you)
85* ( (2.75 * 1.2 * 55+30)/85 * D + d + h + t ) = 886150 damage
expanded (i split it into the first 40 seconds of balance, 15 seconds of whoever you used time dilation on, and the remaining dps without buff
40 * 1.1 * (D + d + h + t) + 15 * (1.1* D + d + h + t) + 30 * (D + d + h + t) =
40 * 1.1 * (2100 + 2100 + 1300 + 1800) + 15 * (1.1* 2100 + 2100 + 1300 + 1800) + 30 * (2100 + 2100 + 1300 + 1800) = 652850 damage
this is of course assuming people are decent at their job but in order to tell right on the spot youd probably need to have to express every party member's dps in terms of the highest party member's dps and try to approximate what these numbers would be like which is. honestly not remotely close to being worthy
TLDR extended rr is better than enhanced if it can last 85 seconds. 82.5 seconds or less means enhanced is better.