For me the answer here depends on 2 things.
First and most important is the fees. If your PRSA has higher fees than your workplace pension, then transfer it in. Lots of studies out there show that fees are the number 1 factor in determining return. I transferred my old PRSA (fee 1%) into my workplace pension (fee 0.55%) for this exact reason.
Second factor to consider is choice of funds. Are you losing the option to invest in a particular fund that you really like, if you transfer your PRSA. This is not usually the case and, in my opinion, is far less important versus fees.
Final factor to consider, if you had much higher balances, or are close to retirement, having 2 separate pension funds allows you more flexibility at retirement. You could draw down on one while still accumulating in the other. But this is not a factor in your particular instance.