Sled & Whirly,
No matter what boat type you want to use stealth is still the key. Every type of boat has advantages and limitations. Knowing them beforehand is obviously very important. As far as making a boat engine run quietly so no one can hear it, well good luck with that one.
Keep in mind a boat load of SEALS armed with the best equipment isn’t going to fit the discription of the average pepper. Plus SEALS have air support and good intell, if things go wrong they have helicopters, a ship for support and trained emergency medical personal to save them. The average prepper will be up the pre verbal shitt creek with no paddle and no place to hide.