Best type of stain to blend in new boards - without taking on too much work

Atlanta, GA

Mostly Shade

I'm not sure what kind of wood the deck is made of - I assume it's pine 2 x 4 for the most part.   This deck is pretty old - the house is 50 years old.

It's very susceptible to mold and mildew.

I've cleaned and re-stained this deck about every year for the past 6 years (mainly just the horizontal surfaces), and it looks great each year right after I do it.  I've never paid close attention to the type of stain I've bought - usually just grab whatever says "Redwood" or "Cedar".

I recently had some boards on the rails replaced due to carpenter bee/woodpecker damage.   Now I'm preparing the house to sell it and need to get the deck looking nice.  

After I stain it, I'd like the newly installed wood to blend in reasonably well with the existing/old wood, but I don't think it needs to be perfect.   It would be OK to me if someone can tell there's some new wood - if they look closely.  I would like to use a stain color that's close to the current stain color, so that if I miss some little parts it's not so obvious - I'd prefer not to have to do a PERFECT job of re-staining all the posts, spindles and parts where I'd need to be on a ladder.  Unless I really do need to do all that work to make the deck look good.

I was wondering if I should try a SEMI SOLID stain?   I'm assuming that a SOLID stain would require me to do a perfect job of re-staining the entire deck - hitting everything.   Or... should I use a SOLID and just commit to doing all the extra work?  

I was thinking I would test out a SEMI SOLID and see how well the new wood blends in.

I would appreciate any advice.   Thanks!!