good evening to everyone, today i have a new question for you guys if you can help me 
i have seary 21 with mercruiser 4.3
originally the steering was equipped with a steering unit like ultraflex ( t86) with 13' cable (rail model)

now cable got stuck and i'm looking for replace it, but it seems that this cable are sold with all the steering rail.
my questions is for my boat shell i go for a new rail as it was, ( so new T86 with TM86 cable) or i can install also normal steering unit like this

wich one is better? pro and cons?
thanks in advance
i have seary 21 with mercruiser 4.3
originally the steering was equipped with a steering unit like ultraflex ( t86) with 13' cable (rail model)

now cable got stuck and i'm looking for replace it, but it seems that this cable are sold with all the steering rail.
my questions is for my boat shell i go for a new rail as it was, ( so new T86 with TM86 cable) or i can install also normal steering unit like this

wich one is better? pro and cons?
thanks in advance