my take on it - if you have a reversal, it's a one off surgery. if it works, you can ttc on your own as much as you want, for one or five more kids. if it doesn't work, you may have to go to ivf - every cycle costs

if you go to ivf straight away - you're forking out for every cycle you go through. every additional child you want you have to go through major hormonal fluctuations etc.

if the only reason you can't ttc on your own if a TL, i'd try the reversal first. IVF is painful, financially, physically and emotionally - if you can avoid it, you should (IMO)