MFH comes under the Tiger-Classis series which is a Legendary product offering from FESTO.
This series were poppet valves for 3/2 and 5/2 valve configurations and spool type for 5/3 variants and have been the best sellers over years.
The VUVS series is a Mordern alternate offering from FESTO with below variants.
1) VUVS : The standard spool series with many options are in valve functions, coil volatges and has working presure upto 10 bar. These come is 1/8" , 1/4" and 3/8" sizes.
2) VUVS-LT : The poppet design valves in 3/2 and 5/2 configurations. These offer various coil voltages and has working pressure upto 10 bar. These come is 1/8" , 1/4" and 3/8" sizes.
3) VUVS-LK : The cost optimised spool deisgn series offereing 3/2 and 5/2 functions in 24 V DC operating voltage. These come is 1/8" , 1/4" and 3/8" sizes

Yes, FESTO does offer wearing part kits for some solenoid valve series.

Valve Terminals are basically many valves installed on a common manifold rail.
These are basically classied under 2 categories:
1) Individual wiring type
2) Multi Pin Wiring or having Communication Interface Using valve terminal simplifies installation, wiring and helps in diagonistics