To elaborate on why I think the ace attorney is actually more powerful than you're giving her credit for, let me explain some of the mechanics of the trial. There is a to-convict number. This number starts at zero and is added and subtracted from by the jury, the judge, the prosecution, and the defense. If at the end of everything it's above 0, you're convicted and sentenced. If it's below 0, you're acquitted. Exactly 0 gives you a hung jury with a chance for either a retrial or walking free.
Jury selection sets the initial level of the to-convict number from 30 points in favor of conviction if the country is 100% Conservative to 30 points in favor of acquittal if the country is 100% liberal, on a sliding scale depending on the current state of the country. The jury is randomly modified up or down by a random number of up to 30 points, and if the judge is a sleeper it's dropped another 20 points.
If you have $5000 attorney, and the jury at this point is still biased to convict (it can be up to +60 at this point if the country is conservative and you get a bad roll), the to-convict number will be cleared and set to -30. If the jury is already biased against convicting, the to-convict number will just be further reduced by another 30 points.
The prosecution then goes. The prosecution adds 40-100 points to the to-convict number, plus 20 points per ex-LCS witness, and an additional bonus based on how scary the crimes you're charged with are -- big ones are likely to be +1 per count of firing an illegal weapon, +1 per count of felony assault, and +2 per count of murder. As you can imagine, this adds up quickly for your FBI's Most Wanted candidates. If the judge is a sleeper, the prosecution's power is divided in half.
The defense then goes. The count appointed attorney adds 0-70. The ace attorney adds 80-150. The sleeper attorney adds 0-70 plus four times law and persuasion (to match ace attorney here, you need 20 total law and persuasion -- they start with 6-14 between the two skills, and have no guarantees of having the stats to get that high). Self-representation is significantly more complicated.
So take a thug with 30 points of penalty for crimes in a moderate society (10 counts of felony assault, 10 counts of firing illegal weapon, 5 counts of murder), with no former LCS testifying against and no sleeper judge.
If you pick your inexperienced sleeper lawyer:
Jury: +30 to -30
Prosecution: +130 to +70
Defense: -40 to -110
Adding those all together, the best case is -70 (skated through easy) and the worst case is +120 (crushed), with a fairly steep bell curve centered on +25. So your thug is most likely going to be convicted.
If you pick your ace attorney:
Jury: -30 to -60
Prosecution: +70 to +130
Defense: -80 to -150
Adding these up your chances vary from +20 to -140, on a similarly steep (and slightly irregular) bell curve centered near -30. So your thug is probably going to walk free.
Now, with a big trial -- let's say your founder just got arrested with 250 points of penalty (25 counts of murder, 100 counts of felony assault, 80 counts of firing an illegal weapon, 10 counts of arson...) and one former LCS testifying against. You have a sleeper lawyer maxed out on their stats with 20 law/persuasion. You have a sleeper judge. And the society is 5/6 liberal.
If you pick the maxed out sleeper lawyer, you get:
Jury: -70 to -10
Prosecution: +155 to +185
Defense: -150 to -80
Best case scenario is -65. Worst case scenario is +95. Bell curve is centered on +15, which is conviction territory. Hold your breath, but your founder's probably getting 50 consecutive life sentences and the LCS breaks apart.
If you pick the ace attorney, you get:
Jury: -100 to -40
Prosecution: +155 to +185
Defense: -150 to -80
Best case scenario is -95. Worst case scenario is +65. Now the bell curve is centered on -15, which is acquittal. Again hold your breath, but this time you're probably going to go free.
These scenarios explain why I say the ace attorney is more powerful 95% of the time. Actually on reference the chance of getting the elite rival for the ace attorney is 1 in 10 (this should probably be dropped significantly to make it more rare) -- the effects of this are the jury effect is removed (Jury set to +0, no matter what) and the prosecution gets +40, making the bell curve center on +15 even for just loitering. So the correct number should be 90% of the time your ace attorney is the better bet, 10% of the time it backfires.