New here. Got the wife an estoril 4.6is

[RVAE34]

I am about to do some more suspension work. I feel a slight thud under sudden braking and a slight shimmy when driving which I assume is the other side front control arms. When I bought it, I did the front driver side only to pass inspection but I ordered the passenger side arms/ball joints, all 4 end links, upper strut mounts/bearings and am leaning towards preventatively replacing the front struts since they seem to be original with near 120k miles. Curious whether I should go with the Bilstein B4 touring struts or the Bilstein 4600’s. The 4600 appears to be the HD since it’s yellow/blue. I just want the car to remain like OE though and have no desire for “performance” on this one. Also got 2 new rear tires. Sticking with the Toyo Proxes ST2.