Every recovery if different
and in my humble opinion
I like snatch straps if your lazy or potentially need that extra snap / pull ...... IE boggy sandy river river beds / boggy muddy crossings / sandy beach bogs ect
They are good for inexperienced 4x4 drivers as you will get the extra pull exactly when you need it ...... though they can be extremely dangerous due to the extream load placed on your strap and vehicle ..... extream caution should be used during any recovery.
Every other recovery is best performed via a singal / double / triple line recovery using the winch ............... slow controlable ect
But on a river crossing you will take on water :'(
A 4x4 with trailer is a very heavy beast to recover and you need to start with the extream recovery techniques and go from there. 4.5T+of static weight is a lot different to your mates unladended 4x4 truck. Plus if it get's soaked / the 4x4 goes under water....... your in the **** with everyone
I have used most recover bit's and pieces and I have seen winch extension straps almost double under extream loads so they two will also offer some snatch strap characteristics.
Using a snatch strap when winching in a very boggy situation can be very usefull ... load up the strap with the winch then use a little go pedal and you will concur what was previously unachievable. It all takes practice and starts with getting your self stuck
All I can say is play it by ear and do what works for you with what gear you have. There is always more than one way to do anything ..... do what you are comfortable with
yogi