If you want quality, go with the GRAY ONE: SYSCOM Duplexer.
Not only does it look different, It is Different!

SYS-1533 - VHF version

SYS-1533. Compact helical VHF duplexer, for full duplex mobile radios or low power repeaters. It uses six cavities of extruded 6063-T5 aluminum. Inner lines are tin plated copper wires. To improve Tx-Rx isolation, conformable coaxial cable is used. For additional protection, the entire unit is corrosion proof painted.

Electrical Specifications:
Frequency Spacing: 5 to10 MHz max.
Power: 50 watts Max.
Insertion Loss, Tx-Ant.: 1.4 dB max 1.2 dB. typ
Insertion Loss, Ant.-Rx: 1.4 dB max 1.2 dB. typ
TX Noise Suppression at RX Freq.: 80 dB min.
VSWR: 1.5:1 max.
Impedance: 50 Ohms
Connectors: BNC ( N, UHF Optional )
Temperature Range: -30¼ to +60¼C