[TG] Airmar R109LH/ LM or LHW with Raymarine CP570

[Michel Rogge]

Am new to this forum, so I take a chance first to say Hello to everyone.
Navigation area: Adriatic/ Croatia
Fishing conditions : offshore. Depth range 15 to 200 m. typically + deep sea fishing down to 1.200 m.
Currently own Botnia Targa 32 equipped with e165 display + CP100 sonar + CPT120 Transducer.
Looking to upgrade to CP 570 Chirp sonar module.
Question : considering the above, what would be the best 2 kw thru-Hull transducer in between R109LH/LM/LHW to optimize detection.
R109LHW seems a good candidate with the advantage of the wide beam, although the High Wide frequency is limited down to 500 feet - not enough to reach the typical +/- 656 feet (200 m.).
Should I therefore rather consider R109LH with narrower beam yet deeper (1.500 feet) signal or the R109LM, which will not give as a good signal in the upper 150 m. ?
Or else, should I rely on the CP100/CPT120 combo to give me the upper water column High frequency signal and therefore combine with the R109LM. I doubt this is the right way to go, since I am not impressed by that configuration.
Not sure I want to use two detectors ( budget issue), although I'd be interested to hear your comment about that option as well.
Thanks in advance. Do I dare saying this is URGENT as my dealer awaits my decision and the boat is on dry berth.
Thanks in advance.