Welcome to the forum!
At 70 and in good physical condition, you are almost certainly in the "low risk" category.
I understand the temptation of TAVR, as the recovery is very quick compared to SAVR. My next door neighbor stopped by last night and informed me that his father in law's pig valve failed, after 12 years, and he just had a TAVR. He was out of the hospital in 36 hours. They also told him to expect it to last about 5 years- he's 75.
Something that you may want to consider is that the mortality rates are higher for TAVR after the first year, compared to SAVR. True, perhaps the new TAVR valves will do better than those in the studies, but remember that these would also be compared against newer tissue valves, which will also possibly show lower mortality rates.
At 70, you would be a prime candidate for a Resilia tissue valve. At 70 and in good condition, you should do fine in the surgery and this valve could easily be one and done for you. It is built on the Magna Ease platform, and Magna Ease typically will last 15-20 years for someone your age. There is also a good possibility that the Resilia will last even longer, given its anti-calcification treatment. Whereas a TAVR might put you in a bad spot in a few years. As another poster mentioned, being a physically active 70 year old, you're likely to have a longer than average life expectancy and there might come a time when you regret getting a band aid procedure of sorts, in order to get back to biking a little sooner.
I had my surgery about 20 months ago and am also very physically active. For me, recovery basically meant doing brisk walking for a few weeks until I got the ok to up it a little with running and biking. I was back with a green light to go at it hard by 3 months. The time passes really quickly.
It's a personal choice and only you can make that decision. I like that you're getting input from a medical team involving your cardiologist, a TAVR specialist and a SAVR specialist. As long as you go in informed, and it sounds like you are, there is no wrong choice. No matter what you choose, we will support you 100%. Please feel free to ask any questions.