Lav mic advice for documentary in field locations
hi! I need help. I'm a journalist who does photo and video. I have made a pair of documentaries and right now I'm buying material for the sound. I'm going to make a documentary in Ukraine at the end of the year and I'm looking at a lav mic for my Sennheiser Profile Wireless and my three options are the Sanken Cos 11-D, Sennheiser MKE2 and Countryman B3. I'm open to more options but I can only spend 300-400 euros.
I will be placing the lavs under a lot of clothes and in field locations, so I want to know what's the best in terms of resistance ande durability and also I'm worried about the RFI because the Sennheiser can record 32 bit internal but I want a lav that has a good RF shielding. I want to hear your recomendations because you are the professionals.
Thank you in advance.
EDIT: I have another spare system with two Boya UHF and lav mics but are very cheap lavs. Also a pair of recorders and a Rode Videomic NTG as a backup sound and portable boom mic. My doubt is about the mic lav.