Hi Dale
I can only comment on the Assurance as I haven't built the other one but the Assurance is my second ship from the Model Slipway and you can't go wrong with them, the kit comes with all the parts required including a glassfibre hull, styrene for the decks, white metal fittings and brass etch sheet. The instructions are clear and precise listing all the tools required, modelling hints and tips and the all important stage by stage construction of the model, you also get two massive plans to reference from.
I'm not far off completing my model which has turned out very nicely and has been a pleasure to build. One thing to note about Model Slipway is the perfect after sales service and advice given if you're not sure or stuck on a stage of the build.
Matt