2.5 V6 or rather 16V… What can you advise me to do?

Hello municipality I have now converted to Opel again and have to buy an Omega B. Only I don’t know which engine to consider, in any case this will run with LPG. I think more of the 2.5 V6. What do you think of the engine in terms of robustness? Does this have a control chain or belt? How does it look with insurance? Is it higher rated like the 16V? MV6 is also something fancy but you see so many engine damages to sell at Mobile and co, d As deterred. Insurance won’t be affordable either. Thanks for your tips