Continue with a water based or start with TWP?

Hello! Will try to keep this short. Two year old pressure treated deck: Used Olympic Maximum Semi Transparent Cedartone (water based) last year on the horizontals and fascia. I left the verticals untouched b/c we liked the look of the natural wood and didn't want something too dark. Needed some pigment on the horizontals due to the amount of sunlight. I almost went with TWP 1500 but the Olympic was lighter and clean up easier. Plus, I can't get TWP locally.

It's now a year later and the verticals need something as the color discrepancy is becoming more noticeable (see pic). The Olympic has also begun to flake off on several deckboards so I will need to touch those areas up and put some thought into its replacement in the next 2-3 years. Unfortunately, I just read this particular stain is difficult to strip. 😡 Not looking forward to that day.

So, I need to choose a product this season for the verticles that I will also use for the rest of the deck, whenever that time comes. I basically want to be able to only have to power wash every year or two and reapply the same stain as needed (2-3 years) w/o stripping. Keeping the deck a light color isn't important anymore.

I would appreciate answers to these questions:

1. Should I stick with a water based for the verticals (same Olympic or maybe Defy Extreme Cedartone)? I'm assuming they'll match ok.

2. If I stay with one of these water based products, can I simply touch up every 2-3yrs without stripping?

3. If I go with oil based (probably TWP 1500 Cedartone) for the verticals this season, I know I will eventually have to strip the deck before applying it to the rest it. For the long term, when reapplying oil based every 2-3 years or as needed, will stripping be required? Or is power washing enough?

Thanks in advance!