I used flexible 1/4" 7x7 SS wire cable, stainless thimbles, and Nicopress swages. I used an inexpensive tool that worked by tightening two bolts to squeeze the fitting between two molds. The cables
are then lashed in place between the thimbles and pulpit/pushpit. This is strong, durable, reliable and cheap
. Having had professionally installed roller-swaged fittings fail I cannot recommend them. Cone fittings (Sta-Lok are my favorites) are great but expensive.
I don't have experience using Dyneema but I would consider it when/if I need to replace the lifelines (now 15 years old).
Edit: I cannot recommend using turnbuckles for the lifelines - I have had them seize up in the tropics. The lashings perform that function; they should be replaced occasionally.