It doen'tmake any difference what arline you arrive on

Taxi/Limo/Grab
Train + taxi or train+LRT/MRT/monorail
Bus + LRT/MRT/monorail or taxi

For a solo traveller a taxi all the way will be a little more expensive than the train+ option, but less clunky. The bus+ is far cheaper, perfectly comfortable and takes about 20 minutes longer than the train (both go to Sentral station).

If you are 2 or more, the train at MYR55 each becomes the most expensive option. 3 or more and its MYR40 each. there's a train + Grab version. It's complicated.

Sentral to BB is relatively easy on public transport .... once you've done it a couple of times! MRT and Monorail go there directy: but the stations are a bit of a trial to get to. LRT is much easier to find but needs a change to MRT at Pasar Seni.

If it'syour first visit a taxi would be the easiest way to go.