Hi. I would recommend the 24hr pass at €6.15 per 24hr period, plus 50c for the first card you buy. Very convenient and easy to use. You don't have to worry how much you have left on the card. Time your first trip so you can use it within the 24hr window for your last trip, say to the airport, if you know what I mean! DV
Viva Viagem is just the name for the rechargeable ticket card (like Oyster in London) on which all transport tickets care are loaded.
If you plan to make more than two tram journeys or more than four bus or metro journeys in one day, the 24hr pass is best value. It also includes the funicular railways and the elevator / lift.
"If you plan to make more than two tram journeys or more than four bus or metro journeys in one day, the 24hr pass is best value. It also includes the funicular railways and the elevator / lift."
Again - you're confusing the "on-board" fare with the "zapping" fare.
When zapping ("like Oyster in London"), a single journey on metro, bus, tram, or funicular, costs €1.30
Thus, by simple mathematics - 4 journeys costs €5.20 (4*1.3), 5 journeys costs €6.50 (=5*1.3).
Ergo more than 4 is the "breakpoint" for any of those modes of transport.
what is the best option for someone visiting 10 days? are there weekly tickets that work out cheaper?
are there weekly tickets that work out cheaper? No.
As to the Lisboa card, we have taken advantage of it on our first couple of trips to Lisbon since convenience was important to us. We also hadn't figured out the ease of the transportation cards. You really have to visit more than a few museums to have it cost effective. Take a look at https://www.lisboacard.org/ and do the math. You also have to understand IF you are there on a Monday, most museums are closed. You also have to realize that it is different than other city cards that we have experienced that allow you to just enter and not stand in line. For example, we had to stand in line at the Jeronimos Monastery.
We also have found that many museums offer discounted senior prices which we have taken advantage of. The Lisboa Card doesn't have a senior card like some city cards that we have purchased. Hard call for you.