Not a lawyer/not an expert, but advice is to start with: Check your state laws.
In my state, a holographic will (must be completely handwritten) is still legally recognized, so as long as everything is either joint owner with right of survivorship or named beneficiaries (which passes outside of any will directives) then handwritten may likely be enough. If it was just two married adults with no minors or even adult children to be concerned with, this likely would be sufficient to cover most cases of any money or property that not otherwise be forgotten about.
But as you have kids, you absolutely should consult a lawyer and not leave it to an online forms. Heirs - especially your children even if they are adults mind you - may not directly inherit and will need to have specific directives attached. Trusts, named items if real property... it can get very complicated. What about if one parent dies while the other is still in the prime of life, and years later remarries a person that also has kids?
For example: my husband's mom. His mom and her sister lost everything from their parents because their mother didn't think about how a remarriage would change things. The grandfather died in his late 40s. His grandmother (L) remarried in her early 50s. They made wills leaving everything to each other, and L assumed that things like certain furnishings and her jewelry and such along with whatever real estate/money would eventually trickle down to her daughters despite not naming things in their very basic wills. They basically said "husband gets everything" if she died and his was the same but unfortunately she died first. Her husband - MIL's step-father (call him A) - kept EVERYTHING as it was legally all his in the will, and refused to give MIL or her sister (husband's aunt) anything from their mother despite L verbally stating before she passed that she'd told A to do so. A even kept her wedding bands from her marriage to their father. When A died, they begged his kids to let them buy back a few things (jewelry and furniture and photos even) but the kids refused and sold off anything of value at auction and even threw away things (they were awful people and just did some of this to be mean). My MIL and her sister had nothing but things that their mother sparingly gave them while she was still alive because she assumed they'd get all her stuff once she was dead.
L took the easy way to dealing with stuff as far as wills and legacy and she ended up deeply hurting her children even as adults. This isn't even taking into consideration real money or property - just sentimental things. Imagine if she'd had a decent nest egg that went to someone else and cut out the family completely.