Granted that the availability of TF, together with the fact that they are the best (pure) archers in teh game, makes them more attractive than JA - however JA have much higher morale and will not run away when things get hot.
The problem in vanilla with the Janissary units is that they all become available at the same time. Historically speaking the janissary corps evolved from pure archers to hybrid archers to an organised army with its own structure and command including arquebusiers, archers, heavy infantry.
This is represented in the game with the three units the JA JI and JHI. All in all personally for me in vanilla both JA and JI are somewhat redundant since they are becoming available together with JHI. The Turks have plenty of other units in their stead and they only lack a heavy infantry unit really (and all the more if it can skewer armored+mounted targets).
Imho its best to;
mod JA in high only
mod JI in high late
mod JHI in late and make them 2 turn trainable.
It would be nice also to give JAs longbows as in many other eastern missile units, reduce the lethality of arbalests and make them available in late only and make crossbows/arbalests available only to the Almohads (that lack bow units).
Such an arrangement balances out the missile strengths/weaknesses between east and west and makes them more unique without cutting out potential.
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